Created sanitizers_test.rb. Copied the sanitizer test from html-scanner replaced HTML:: with ActionView::
Updated WhiteListSanitizers sanitize method to treat options as an optional argument.
Implemented assert_dom_equal with Loofah. Added Loofah as a dependency in actionpack.gemspec.
Added a contains_bad_protocol? to ActionView::WhiteListSanitizer.
Changed the order of name and href in a-tag to match with output.