Add a .ruby-version file
Add a .travis.yml to make use of new Docker containers
(http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/)
Merge pull request #62 from pgib/fix/dot-ruby-version

Add a .ruby-version file
Merge pull request #63 from pgib/update/travis

Faster Travis builds
Merge remote-tracking branch 'upstream/master' into version-0.6.13