Removed ActionView::Assertions. Getting ready to exchange with Rails::Dom::Testing::Assertions.
Exchanged requiring of action view assertions with rails dom testing assertions.
Changed deprecation message in dom and selector assertions in Action Dispatch.
Required rails-dom-testing in test_case.rb
Removed assert_select test file, since it has been moved to rails-dom-testing.
Included DomAssertions in url_helper- and atom_feed_helper_test.rb.
Removed sanitizers- and scrubbers_test.rb. They are in rails-html-sanitizer.
Fixed deprecated selector in form_collections_helper_test.rb with from catch_invalid_selector. Sweet.