Please add a gem to rubygems.org

[jdufresne]

Please upload a ruby gem to rubygems.org as an alternative way to install this library. The README suggests to install the gem using the git repository, but this has some drawbacks, namely:

1. Pinning an exact tested and released version in Gemfile.lock
2. Auto-updating to new tested and released versions as they are vetted and distributed

Adding releases to rubygems.org would still allow existing users to install using git if they prefer.

Thanks for the nice package!