Merge branch 'release/0.12.0' into develop

* release/0.12.0:
  Updated change log and version
Merge branch 'hotfix/0.12.1' into develop

* hotfix/0.12.1:
  * Updated gems
* RSpec 3
* Updated gems
Merge branch 'release/0.13.0'

* release/0.13.0:
  * RSpec 3 * Updated gems