update test app kickstarter gem version
update redactor html editor

+ update version to 9.1.6
+ implement autosave
+ remove save and cancel buttons
+ rename to html_editor.js.coffee
update changelog

# fixes #164
update specs
update test app
Merge branch 'feature/update-redactor' into develop

* feature/update-redactor:
  update test app
  update specs
  update changelog
  update redactor html editor
  update test app kickstarter gem version