Update travis config file

This commit adds ruby 1.9.3, puppet 3.0.2 support and a
build status image to the README.
Merge pull request #105 from blkperl/update_travis

Update travis config file
Build all branches on travis

We should build all branches for travis, otherwise users won't be able to test
their own feature branches.
Merge pull request #106 from blkperl/build_all_branches

Build all branches on travis