Enabled updater, TODO: make updater do less work than installer

lib/application_manager/tasks/updater.rb

@@ -1,19 +1,9 @@
 class W3DHub
   class ApplicationManager
-    class Updater < Task
+    class Updater < Installer
       def type
         :updater
       end
-
-      def exec_task
-        # Fetch manifests
-        # Load manifests
-        # build file list
-        # find new packages
-        # unpack new packages
-        # TODO: detect patch files and handle them
-        # update installed game version
-      end
     end
   end
 end