Merge branch 'release/6.1.0' into develop

* release/6.1.0:
  * Ruby 2.1.2 * Fixed rspec-rails gem group * Updated gems
  * Planning to support source maps * Updated gems * Fixed rspec-rails gem group
Merge branch 'hotfix/6.1.1' into develop

* hotfix/6.1.1:
  * Fixed travis build
Merge branch 'hotfix/6.1.2' into develop

* hotfix/6.1.2:
  * Fixed readme * Updated gems
Merge branch 'hotfix/6.1.3' into develop

* hotfix/6.1.3:
  * Updated gems
Merge branch 'hotfix/6.1.4' into develop

* hotfix/6.1.4:
  * Updated gems
Merge branch 'hotfix/6.1.5' into develop

* hotfix/6.1.5:
  * Updated gems
* Support for app.json
* Updated gems
* Support for app.json
* Updated gems
[ci skip]
Fixed readme
[ci skip]
removed db:setup from app.json
[ci skip]
Fixed newrelic config
Improved GC
[ci skip]
fixed conflicts
fixed previous merge
[ci skip]
Merge branch 'release/7.0.0'

* release/7.0.0:
  fixed previous merge [ci skip]
  Fixed newrelic config Improved GC [ci skip]
  removed db:setup from app.json [ci skip]
  Fixed readme [ci skip]
  * Support for app.json * Updated gems [ci skip]
  * Support for app.json * Updated gems