Merge pull request #24 from aq1018/master

Make gem compatible with ruby 1.8.7 again. Added Travis-ci.org support
Bump version now that we have 1.8.7 support back
Add travis CI buttons
Add aq1018 and akahn as contributors
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Add aq1018 and akahn as contributors
  Add travis CI buttons
  Bump version now that we have 1.8.7 support back