Merge branch 'hotfix/2.1.1'

* hotfix/2.1.1:
  Fixed README [ci skip]
Merge branch 'release/2.2.0'

* release/2.2.0:
  * FontAwesome 4.0.3 * Updated gems
Merge branch 'release/2.3.0'

* release/2.3.0:
  * Bootstrap 3.0.2 * Updated gems
* Fixed update of gems
Merge branch 'hotfix/2.3.1' into develop

* hotfix/2.3.1:
  * Fixed update of gems