Run 'bundle clean' after installing gems to get rid of unused gems
Added helper for shebang scripts using /usr/bin/ruby
Run gem install/update without installing rdoc/ri to speed up build
Add 'Gemfile.lock' into artifacts and make path relative to $HOME
Reorganize the repository layout to minimize the number of layers in Docker image
Merge pull request #10 from mfojtik/ruby_improv

Various ruby image improvements