Merge branch 'hotfix/2.8.3'

* hotfix/2.8.3:
  * Improved glyphicons paths
Merge branch 'release/2.9.0'

* release/2.9.0:
  Updated version in change log
  * Bootstrap v3.1.1
* Updated Rails dependency to 3.2.17
Merge branch 'hotfix/2.9.1' into develop

* hotfix/2.9.1:
  * Updated Rails dependency to 3.2.17