Merge branch 'hotfix/2.12.1'

* hotfix/2.12.1:
  * Tested against Ruby 2.1.3
* Tested against Rails 3.2.20, 4.0.11 and 4.1.7
* Open-ended dependencies for development gems
Merge branch 'release/2.13.0'

* release/2.13.0:
  * Tested against Rails 3.2.20, 4.0.11 and 4.1.7 * Open-ended dependencies for development gems
  Improved readme [ci skip]
* bootstrap 3.3.0
Merge branch 'release/2.14.0'

* release/2.14.0:
  * bootstrap 3.3.0
* bootstrap 3.3.1
Merge branch 'release/2.15.0'

* release/2.15.0:
  * bootstrap 3.3.1
Merge branch 'release/2.15.0' into develop

* release/2.15.0:
  * bootstrap 3.3.1
* Tested against Rails 3.2.21, 4.0.12 and 4.1.8
* Improved dependencies
* Improved readme
Merge branch 'hotfix/2.15.1' into develop

* hotfix/2.15.1:
  * Tested against Rails 3.2.21, 4.0.12 and 4.1.8 * Improved dependencies * Improved readme
Merge branch 'develop' into feature/rails-4.2

* develop:
  * Tested against Rails 3.2.21, 4.0.12 and 4.1.8 * Improved dependencies * Improved readme
  * bootstrap 3.3.1
  * bootstrap 3.3.0
  * Tested against Rails 3.2.20, 4.0.11 and 4.1.7 * Open-ended dependencies for development gems
Tested against rails 4.2.0.rc1