Support gemfile key on source and matrix and use that on the 
ruby middleware. Setting Gemfile as default Gemfile
Merge pull request #2 from pacoguzman/extend-ruby-source

Support gemfile key on source and matrix
version bump
cleanup script/ruby#gemfile
version bump
add cache.directories to source
version bump
remove puts
add image key
version bump
add script#image method
fixed rbenv, add after_success key
version bump
add language for ruby
version bump
add VX_PRIVATE_KEY env
add java and scala, fixed env issues
version bump
fixed /etc/profile.d loader
add clojure, fixed scala language detection