As a developer using the NDS Labs platform, I should be able to easily edit and debug Ruby code.

Ruby is a scripting language that is typically used with the Rails web application framework (aka "Ruby on Rails").

Some useful features might include:

1. Local debugging
2. Running from command-line (ruby, irb)
3. Remote debugging

Although plenty of options exist, Cloud9 seemed to be a good jumping-off point since the built-in terminal, #2 and therefore #3 should be fairly easy

This ticket can be closed when a suitable Ruby development environment has been packaged as an NDS Labs service spec pointing to a tagged Docker image (i.e. not "latest")