A small (and safe) portion of #130.
Based on #130, clean up Gemfile
Hey Hiro, aasome that someone is looking into Warbler ... I've been checking a few PRs myself previously ...
Unfortunately, some already assumed the project being dead ... despite having a good commit or two maybe if those can get a review as well esp. compilation related ones // cc @whitequark
@kares Thanks for pointing out @whitequark's fork. It just means that we need to put out a release soon-ish. 😃