Updating Gap to the GHC 7.7 trunk API.
Merge pull request #177 from scottgw/master

Updating Gap to the GHC 7.7 trunk API.
cleaning up warnings.
workaround for the next HP.
closed import.
Add Travis-CI build status image
Run tests with multiple GHC versions on Travis-CI
.travis.yml: Install the latest happy
Merge pull request #178 from eagletmt/multi-ghc-travis

Run tests with multiple GHC versions on Travis-CI
fix for GHC 7.2.x.