Add TravisCI config.

Someone with repo admin rights will need to sign in to the [profile 
page](https://travis-ci.org/profile) and flip the switch to turn on 
Travis for this repo. (See [getting
started](http://about.travis-ci.org/docs/user/getting-started/) for
details.)

Once that is finished will need to add a service hook in Github. [see
here](https://github.com/travis-ci/travis-ci.github.com/blob/master/pt-BR/docs/user/how-to-setup-and-trigger-the-hook-manually.md)
for details.