Merge branch 'release/2.8.0' into develop

* release/2.8.0:
  * Bootstrap v3.1.0 * Updated Bootstrap license to MIT
Merge branch 'hotfix/2.8.1' into develop

* hotfix/2.8.1:
  * Fixed gem version number
Merge branch 'develop' of github.com:diowa/twbs_less_rails into develop

* 'develop' of github.com:diowa/twbs_less_rails:
Merge branch 'hotfix/2.8.2' into develop

* hotfix/2.8.2:
  * Improved tests
Merge branch 'hotfix/2.8.3' into develop

* hotfix/2.8.3:
  * Improved glyphicons paths
* Bootstrap v3.1.1
Updated version in change log
Merge branch 'release/2.9.0'

* release/2.9.0:
  Updated version in change log
  * Bootstrap v3.1.1