Add .travis.yml so travis-ci.org could build it.
Add .travis.yml so travis-ci.org could build it.

openeducation/travis-ci,flores/travis-ci,fxposter/travis-ci,openeducation/travis-ci,flores/travis-ci,openeducation/travis-ci,flores/travis-ci,fxposter/travis-ci,fxposter/travis-ci