Migrate to own FastHtmlDiff.
Add warnings to compatibility tool.
Bug/typo in compatibility check where linking excepted.
Add clear button to compatibility tool.
Add clear button to compatibility tool.
Add clear button to compatibility table.
Migrate to own FastHtmlDiff lib for comparisons and remove comparison caching.
Gemfile update to use latest version of FastHtmlDiff lib.
Merge branch 'w_fast_html_diff'