diff --git a/.travis.yml b/.travis.yml
index 008e6dc..63c205f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,8 +8,7 @@ cache:
   directories:
     - "node_modules"
 install:
-  - npm install -g codecov
-  - npm install -g istanbul
+  - npm install -g npx
 script:
-  - istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec
-  - codecov
+  - npx istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec
+  - npx codecov
diff --git a/package-lock.json b/package-lock.json
index bd67ee2..adfd3df 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -255,6 +255,23 @@
         "xtend": "^4.0.1"
       }
     },
+    "align-text": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "requires": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      }
+    },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
     "angular": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/angular/-/angular-1.7.2.tgz",
@@ -333,11 +350,29 @@
         "buffer-equal": "^1.0.0"
       }
     },
+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
+    },
     "archy": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
       "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA="
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -573,6 +608,150 @@
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.1.tgz",
       "integrity": "sha1-ri1acpR38onWDdf5amMUoi3Wwio="
     },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
+      }
+    },
+    "babel-generator": {
+      "version": "6.26.1",
+      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
+      "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
+      "dev": true,
+      "requires": {
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "detect-indent": "^4.0.0",
+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
+        "source-map": "^0.5.7",
+        "trim-right": "^1.0.1"
+      },
+      "dependencies": {
+        "jsesc": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-1.3.0.tgz",
+          "integrity": "sha1-RsP+yMGJKxKwgz25vHYiF226s0s=",
+          "dev": true
+        },
+        "lodash": {
+          "version": "4.17.10",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
+          "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+          "dev": true
+        }
+      }
+    },
+    "babel-messages": {
+      "version": "6.23.0",
+      "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.23.0.tgz",
+      "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "^6.22.0"
+      }
+    },
+    "babel-runtime": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+      "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+      "dev": true,
+      "requires": {
+        "core-js": "^2.4.0",
+        "regenerator-runtime": "^0.11.0"
+      }
+    },
+    "babel-template": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.26.0.tgz",
+      "integrity": "sha1-3gPi0WOWsGn0bdn/+FIfsaDjXgI=",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "lodash": "^4.17.4"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.10",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
+          "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+          "dev": true
+        }
+      }
+    },
+    "babel-traverse": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
+      "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
+      "dev": true,
+      "requires": {
+        "babel-code-frame": "^6.26.0",
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "debug": "^2.6.8",
+        "globals": "^9.18.0",
+        "invariant": "^2.2.2",
+        "lodash": "^4.17.4"
+      },
+      "dependencies": {
+        "globals": {
+          "version": "9.18.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-9.18.0.tgz",
+          "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==",
+          "dev": true
+        },
+        "lodash": {
+          "version": "4.17.10",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
+          "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+          "dev": true
+        }
+      }
+    },
+    "babel-types": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+      "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "^6.26.0",
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.4",
+        "to-fast-properties": "^1.0.3"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.10",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
+          "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+          "dev": true
+        },
+        "to-fast-properties": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
+          "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
+          "dev": true
+        }
+      }
+    },
+    "babylon": {
+      "version": "6.18.0",
+      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
+      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+      "dev": true
+    },
     "bach": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/bach/-/bach-1.2.0.tgz",
@@ -1135,6 +1314,17 @@
       "resolved": "https://registry.npmjs.org/capture-stack-trace/-/capture-stack-trace-1.0.0.tgz",
       "integrity": "sha1-Sm+gc5nCa7pH8LJJa00PtAjFVQ0="
     },
+    "center-align": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
+      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "align-text": "^0.1.3",
+        "lazy-cache": "^1.0.3"
+      }
+    },
     "chai": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.1.2.tgz",
@@ -1411,6 +1601,12 @@
       "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
       "dev": true
     },
+    "compare-versions": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/compare-versions/-/compare-versions-3.3.0.tgz",
+      "integrity": "sha512-MAAAIOdi2s4Gl6rZ76PNcUa9IOYB+5ICdT41o5uMRf09aEu/F9RK+qhe8RjXNPwcTjGV7KU7h2P/fljThFVqyQ==",
+      "dev": true
+    },
     "component-emitter": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
@@ -1577,6 +1773,12 @@
         "is-plain-object": "^2.0.1"
       }
     },
+    "core-js": {
+      "version": "2.5.7",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.7.tgz",
+      "integrity": "sha512-RszJCAxg/PP6uzXVXL6BsxSXx/B05oJAQ2vkJRjyjrEcNVycaqOmNb5OTxZPE3xa5gwZduqza6L9JOCenh/Ecw==",
+      "dev": true
+    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -1752,6 +1954,23 @@
         }
       }
     },
+    "default-require-extensions": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-2.0.0.tgz",
+      "integrity": "sha1-9fj7sYp9bVCyH2QfZJ67Uiz+JPc=",
+      "dev": true,
+      "requires": {
+        "strip-bom": "^3.0.0"
+      },
+      "dependencies": {
+        "strip-bom": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+          "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+          "dev": true
+        }
+      }
+    },
     "default-resolution": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/default-resolution/-/default-resolution-2.0.0.tgz",
@@ -1882,6 +2101,15 @@
       "resolved": "https://registry.npmjs.org/detect-file/-/detect-file-1.0.0.tgz",
       "integrity": "sha1-8NZtA2cqglyxtzvbP+YjEMjlUrc="
     },
+    "detect-indent": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-4.0.0.tgz",
+      "integrity": "sha1-920GQ1LN9Docts5hnE7jqUdd4gg=",
+      "dev": true,
+      "requires": {
+        "repeating": "^2.0.0"
+      }
+    },
     "detective": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/detective/-/detective-5.1.0.tgz",
@@ -2123,6 +2351,12 @@
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
+    "esprima": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
+      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
+      "dev": true
+    },
     "esutils": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
@@ -2450,6 +2684,16 @@
         "time-stamp": "^1.0.0"
       }
     },
+    "fileset": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/fileset/-/fileset-2.0.3.tgz",
+      "integrity": "sha1-jnVIqW08wjJ+5eZ0FocjozO7oqA=",
+      "dev": true,
+      "requires": {
+        "glob": "^7.0.3",
+        "minimatch": "^3.0.3"
+      }
+    },
     "fill-range": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-4.0.0.tgz",
@@ -4387,6 +4631,95 @@
         "glogg": "^1.0.0"
       }
     },
+    "handlebars": {
+      "version": "4.0.11",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.0.11.tgz",
+      "integrity": "sha1-Ywo13+ApS8KB7a5v/F0yn8eYLcw=",
+      "dev": true,
+      "requires": {
+        "async": "^1.4.0",
+        "optimist": "^0.6.1",
+        "source-map": "^0.4.4",
+        "uglify-js": "^2.6"
+      },
+      "dependencies": {
+        "async": {
+          "version": "1.5.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "dev": true
+        },
+        "camelcase": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+          "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+          "dev": true,
+          "optional": true
+        },
+        "cliui": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
+          "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "center-align": "^0.1.1",
+            "right-align": "^0.1.1",
+            "wordwrap": "0.0.2"
+          }
+        },
+        "source-map": {
+          "version": "0.4.4",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
+          "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
+          "dev": true,
+          "requires": {
+            "amdefine": ">=0.0.4"
+          }
+        },
+        "uglify-js": {
+          "version": "2.8.29",
+          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
+          "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "source-map": "~0.5.1",
+            "uglify-to-browserify": "~1.0.0",
+            "yargs": "~3.10.0"
+          },
+          "dependencies": {
+            "source-map": {
+              "version": "0.5.7",
+              "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+              "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+              "dev": true,
+              "optional": true
+            }
+          }
+        },
+        "wordwrap": {
+          "version": "0.0.2",
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
+          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
+          "dev": true,
+          "optional": true
+        },
+        "yargs": {
+          "version": "3.10.0",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+          "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "camelcase": "^1.0.2",
+            "cliui": "^2.1.0",
+            "decamelize": "^1.0.0",
+            "window-size": "0.1.0"
+          }
+        }
+      }
+    },
     "has": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
@@ -4859,6 +5192,15 @@
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
       "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI="
     },
+    "is-finite": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/is-finite/-/is-finite-1.0.2.tgz",
+      "integrity": "sha1-zGZ3aVYCvlUO8R6LSqYwU0K20Ko=",
+      "dev": true,
+      "requires": {
+        "number-is-nan": "^1.0.0"
+      }
+    },
     "is-fullwidth-code-point": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
@@ -4999,12 +5341,103 @@
       "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
       "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8="
     },
+    "istanbul": {
+      "version": "1.1.0-alpha.1",
+      "resolved": "https://registry.npmjs.org/istanbul/-/istanbul-1.1.0-alpha.1.tgz",
+      "integrity": "sha1-eBeVZWAYohdMX2DzZ+5dNhy1e3c=",
+      "dev": true,
+      "requires": {
+        "abbrev": "1.0.x",
+        "async": "1.x",
+        "istanbul-api": "^1.1.0-alpha",
+        "js-yaml": "3.x",
+        "mkdirp": "0.5.x",
+        "nopt": "3.x",
+        "which": "^1.1.1",
+        "wordwrap": "^1.0.0"
+      },
+      "dependencies": {
+        "abbrev": {
+          "version": "1.0.9",
+          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+          "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+          "dev": true
+        },
+        "async": {
+          "version": "1.5.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "dev": true
+        },
+        "nopt": {
+          "version": "3.0.6",
+          "resolved": "https://registry.npmjs.org/nopt/-/nopt-3.0.6.tgz",
+          "integrity": "sha1-xkZdvwirzU2zWTF/eaxopkayj/k=",
+          "dev": true,
+          "requires": {
+            "abbrev": "1"
+          }
+        }
+      }
+    },
+    "istanbul-api": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/istanbul-api/-/istanbul-api-1.3.1.tgz",
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@@ -5117,6 +5634,13 @@
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@@ -5334,6 +5858,12 @@
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@@ -12368,6 +12898,30 @@
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@@ -13570,6 +14158,12 @@
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@@ -14230,6 +14824,13 @@
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@@ -14795,6 +15396,19 @@
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diff --git a/package.json b/package.json
index 50b16cb..60cb148 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
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