Adds engines 2.1.0 plugin.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1654 e93f8b46-1217-0410-a6f0-8f06a7374b81

vendor/plugins/engines/init.rb

@@ -0,0 +1,5 @@
+# Only call Engines.init once, in the after_initialize block so that Rails
+# plugin reloading works when turned on
+config.after_initialize do
+  Engines.init if defined? :Engines
+end