v3.1.1

1. Chore/improve readme
2. Upgrade PhantomJS version for travis and remove deprecation warning
3. Add Tests in Rails 5+
4. Bump ruby version support
5. Fix markdown rendering of headings
6. Fix README markdown preview
7. Add a best_in_place:before-update event
8. add option[:skip_blur] to play nice with wysiwhtml5
   Thank you everybody who contributed to this release.
   Thanks @rbritom for preparing the release.