Added Loofah as a dependency in actionview.gemspec.
Implemented ActionView: FullSanitizer, LinkSanitizer and WhiteListSanitizer in sanitizers.rb.
Deprecated protocol_separator and bad_tags.
Added new tests in sanitizers_test.rb and reimplemented assert_dom_equal with Loofah.
Removed duplication in the deprecated methods.
Added PermitScrubber which allows you to permit elements for sanitization.
Reordered form removal with stripping.
Removed the contains_bad_protocols? method as well as the tests for it. Loofah already deals with this.