Travis ci

[jstastny]

This adds support for build on Travis-CI.

Before merge, you will need to change the .travis.yml and change the encrypted API key, because your Travis build will not be able to decrypt mine. You will have to encprypt it for your repository using this approach http://docs.travis-ci.com/user/encryption-keys/

[jstastny]

You will also need to change the URL to the Build status icon in README.md.

[chrismayer]

Hi @jstastny,

thanks a lot for your PR! This is very cool, I like the idea of having CI for this project. I will take care of this in the next few days. I guess it is useful to wait until #7 and #8 are merged before this will be applied.