Enable Travis CI

Enables Travis CI for automated builds.

This patch enables builds to automatically test building on openjdk6, openjdk7, and oraclejdk7 as well as adds a Travis CI build status badge to the README file.

Some steps need to be completed in order to enable Travis CI on this repository:
    http://about.travis-ci.org/docs/user/getting-started/


Example builds:  https://travis-ci.org/zxiiro/Chat