Merge branch 'hotfix/0.19.7'

* hotfix/0.19.7:
  * Fixed sass dependency * Improved reference template
* Removed deprecated .css extension in Sass files
* Added quiet_assets gem
Merge branch 'hotfix/0.19.8' into develop

* hotfix/0.19.8:
  * Removed deprecated .css extension in Sass files * Added quiet_assets gem