Only use travis_retry if on Travis
Fixed shell retry spec
Edited README.md

Added table of contents, status image, and changed tabs into four spaces instead of having a mixture of both.
Merge pull request #57 from Joshua-Anderson/readme-stuff

Edited README.md
Update git repo
Merge pull request #58 from Joshua-Anderson/gemspec

Change URL in gemspec to point to new repository
Added codeclimate badge to readme
Merge pull request #61 from Joshua-Anderson/codeclimate

Add Code Climate badge to README
Fix newlines in README
Fixed typo in README