Move plugins to separate directory.

plugins/wiki/lib/foodsoft_wiki.rb

@@ -0,0 +1,13 @@
+require 'wikicloth'
+require 'acts_as_versioned'
+require 'diffy'
+require 'content_for_in_controllers'
+require 'foodsoft_wiki/engine'
+
+module FoodsoftWiki
+  # Return whether the wiki is used or not.
+  # Enabled by default in {FoodsoftConfig} since it used to be part of the foodsoft core.
+  def self.enabled?
+    FoodsoftConfig[:use_wiki]
+  end
+end