Run specs as default Rake task
Build with Travis CI
Merge pull request #5 from envato/travis_ci

Prepare for Travis CI
Add rake to Gemfile

Just for you, Travis:

> `rake is not part of the bundle. Add it to Gemfile.`
Install correct actionpack
Add Travis build status to README
Merge pull request #6 from envato/travis_ci

More Travisification
Merge remote-tracking branch 'origin/master' into string-key-fix-from-zendesk

To pick up Travis CI changes

Fixes #3