Adding travis and coveralls

Also fixed an issue where the coverage.xml wasn't
generated by cobertura

MINT-1581
Merge pull request #2 in MINT/java-checkout from MINT-1581_adding_build_status_images to v1.1

* commit '33f5037b2ff538fd6f5c3bc5c85cc2303bf28ada':
  Adding travis and coveralls