Update mix.exs to comply with exrm release system

mix.exs

@@ -15,7 +15,9 @@ defmodule Ejabberd.Mixfile do
 
   def application do
     [mod: {:ejabberd_app, []},
-     applications: [:kernel, :stdlib]]
+     applications: [:ssl],
+     included_applications: [:p1_logger,:p1_yaml,:p1_tls,:p1_xml,:p1_stringprep,:p1_zlib,:p1_cache_tab,:mnesia,:p1_utils,
+                             :p1_iconv,:esip,:p1_stun,:ehyperloglog,:p1_mysql,:p1_pgsql,:eredis]]
   end
   
   defp erlc_options do