I am a BIG fan of Ruby - though I much prefer JRuby to MRI Ruby.
However, I have to ask WHY?
What does your Gem do that makes life easier than using the Arduino IDE?
In my opinion it would need to be a lot better (a) to justify the trouble of learning how to use it (and I don't see any documentation on your Github site) and (b) to justify using a non-standard product that most people using this Forum will be unfamiliar with.
...R