Add Travis CI to AeroGear.js repo

Based on https://github.com/aerogear/aerogear-js/pull/29, you need to do the following things:

1) Authorize the aerogear GitHub account on Travis and add https://github.com/aerogear/aerogear-js
2) Update the references to "kborchers" in the README.md to "aerogear"
3) Profit