Merge branch 'hotfix/0.12.1'

* hotfix/0.12.1:
  * Updated gems
Merge branch 'release/0.13.0'

* release/0.13.0:
  * RSpec 3 * Updated gems
* Updated gems
* Improved README
Merge branch 'hotfix/0.13.1' into develop

* hotfix/0.13.1:
  * Updated gems * Improved README