Add AV as development dependency for railties

It's needed for tests

railties/railties.gemspec

@@ -28,4 +28,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'rake', '>= 0.8.7'
   s.add_dependency 'thor', '>= 0.18.1', '< 2.0'
+
+  s.add_development_dependency 'actionview', version
 end

railties/test/abstract_unit.rb

@@ -8,6 +8,7 @@ require 'fileutils'
 
 require 'active_support'
 require 'action_controller'
+require 'action_view'
 require 'rails/all'
 
 module TestApp