Switch from simplecov to coveralls for code coverage (in the cloud!!!)
Add coverage status to the readme
Replace any system calls in lib that don't use git with calls to FileUtils
Replace a system call in the spec helper
Merge pull request #101 from nicolasmccurdy/use-libraries

Use stdlib methods to replace most non-git shell calls. Looks good.
Add a Gitter badge to the readme
Merge pull request #100 from nicolasmccurdy/use-coveralls

Use coveralls