[feature] added ruby version commandline config; default MRI 2.2.4 ve…

…rsion

[feature] added --rbenv option

version bump

version bump

[feature] pregenerate database.yml and secrets.yml for Capistrano

[feature] added PG database and user generating

[fix] PG cookbook config fix; RVM cookbook config fix; node and data_…

…bag folder path fix

[cleanup] removed redundant gem dependencies