include eldap in OTP releases

Closes #1313

mix.exs

@@ -63,7 +63,15 @@ defmodule Pleroma.Mixfile do
   def application do
     [
       mod: {Pleroma.Application, []},
-      extra_applications: [:logger, :runtime_tools, :comeonin, :quack, :fast_sanitize, :ssl],
+      extra_applications: [
+        :logger,
+        :runtime_tools,
+        :comeonin,
+        :quack,
+        :fast_sanitize,
+        :ssl,
+        :eldap
+      ],
       included_applications: [:ex_syslogger]
     ]
   end