FEATURE: split JavaScript application bundle, so plugins live in own file

This adds plugin.js and plugin_third_party.js files

lib/discourse.rb

@@ -97,6 +97,7 @@ module Discourse
     set
   end
 
+
   def self.activate_plugins!
     all_plugins = Plugin::Instance.find_all("#{Rails.root}/plugins")
 
@@ -138,6 +139,14 @@ module Discourse
     @plugins ||= []
   end
 
+  def self.official_plugins
+    plugins.find_all{|p| p.metadata.official?}
+  end
+
+  def self.unofficial_plugins
+    plugins.find_all{|p| !p.metadata.official?}
+  end
+
   def self.assets_digest
     @assets_digest ||= begin
       digest = Digest::MD5.hexdigest(ActionView::Base.assets_manifest.assets.values.sort.join)