buildpacks/ruby: Fix rvm gemset ignore
buildpacks/ruby: Reduce verbosity of nodejs untar
buildpacks/ruby: Step away from project sources before installing ruby so that RVM does not parse .ruby-gemset / .ruby-version automagically
buildpacks/ruby: bundle install with "--jobs=4"
buildpacks/ruby: Use 4 jobs for bundle install
addons: Fix provisioning script
buildpacks/ruby: Properly escape $PATH to fix GH-32
buildpacks/ruby: Fix code that upgrades bundler 1.5.0 to deal with the fact that we completely disabled gemsets