Bump to Rails 4.1.0.beta1
Fix webmock version in Gemfile.lock
Bump to rails 4.1
Update Gemfile with Rails 4.1 and should-matchers master
Rename scope named public because AR defined it already
Update integration tests files with ActionDispatch::IntegrationTest

- ActionController::IntegrationTest is deprecated in favor of ActionDispatch::IntegrationTest
Update test_helper with ActionDispatch module for integration tests