Enable Travis CI build automation

Enables Travis CI for automated builds.

This patch enables builds to automatically test building on oraclejdk7 (default) as well as adds a Travis CI build status badge to the README file.

Some additional 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/goclipse