Use Travis CI to build and test KyTea

This enables a simple continuous integration using Travis CI, which is nicely integrated with GitHub. Only the thing you need to use Travis CI is to
connect your repository with Travis CI. Please check http://sue445.hatenablog.com/entry/2013/06/01/170607 for example. You'll get the idea how to set up. For more details, see http://docs.travis-ci.com/user/getting-started/