Fixed the initialization to be explicitly included in ActionView::Base

By the time the plugin loads, ActionView::Base has Helpers module
already included, so it's missing the appended features from DynamicForm
module. Fixed it by including DynamicForm module directly into the
ActionView::Base.

init.rb

@@ -1 +1,5 @@
-require 'action_view/helpers/dynamic_form'
+require 'action_view/helpers/dynamic_form'
+
+class ActionView::Base
+  include DynamicForm
+end

lib/action_view/helpers/dynamic_form.rb

@@ -287,8 +287,6 @@ def error_messages(options = {})
       end
     end
 
-    include DynamicForm
-
     class InstanceTag
       include DynamicForm::InstanceTagMethods
     end
@@ -299,4 +297,4 @@ class FormBuilder
   end
 end
 
-I18n.load_path << File.expand_path("../../locale/en.yml", __FILE__)
+I18n.load_path << File.expand_path("../../locale/en.yml", __FILE__)