Fixed bug in page caching that prevented it from working at all

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@447 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/caching.rb

@@ -121,7 +121,7 @@ def cache_page(content = nil, options = {})
 
       private
         def caching_allowed
-          !@request.method.post? && (@request.parameters.reject {|k, v| ['id', 'action', 'controller'].include?(k)}).empty?
+          !@request.post? && (@request.parameters.reject { |k, v| %w( id action controller ).include?(k) }).empty?
         end
     end