Merge branch 'release/v0.1.2' into develop

* release/v0.1.2:
  Adding v0.1.2 to Changelog
  Removing version from composer.json
Changing formatter for travis phpspec runs
Adding MessageResponse to unify success/error responses
Updating Readme/Changelog
Merge branch 'release/v0.1.3'

* release/v0.1.3:
  Updating Readme/Changelog
  Adding MessageResponse to unify success/error responses
  Changing formatter for travis phpspec runs