Ruby buildpack

This buildpack will install Ruby 1.9.3+ and will use Bundler for dependency management. It will be used if a Gemfile is found.

The installed Ruby will be the same one that gets installed on Heroku's Cedar 14 stack with a fallback to a Ruby from the Cedar stack. By default Ruby 2.2.2 and Bundler 1.10.5 will be installed.

To specify a Ruby version, use the ruby directive of your project's Gemfile, the DEVSTEP_RUBY_VERSION environmental variable or a .ruby-version on you project's root.

To specify a Bundler version, use the the DEVSTEP_BUNDLER_VERSION environmental variable.