Merge pull request #2 from bnd5k/master

README: added comparison of different branching approaches
Update README.md

Upgraded Ben Downey from Feedback Provider to Contributor
Update .travis.yml

Excluding Ruby 1.8.7 temporarily as it is causing Travis CI issues with Coveralls and Bundler (https://github.com/bundler/bundler/issues/2784)
Update README.md

Fixed formatting for committers and contributors
Added rails to gemfile
converted gem to rails engine