Add travis continuous integration support.

To enable travis:
 - Head to https://travis-ci.org/ and sign in with your github account.
 - Sync your github list with travis in your account page, and then enable travis for configgles (see screenshot).
 - Merge this branch (if you approve).

You can see the outcome of a run on my fork here: https://travis-ci.org/qubyte/configgles and the outcome/progress of your repo at a similar address. You can get status images by clicking on the little gear icon on this page (you commonly see this in README files on github).

![screenshot](https://f.cloud.github.com/assets/824753/99609/6f262926-6798-11e2-9166-7ce6207a915c.jpg)

Below this you should see a green band with *good to merge* in it. This happens when travis has been able to run the tests on the pull request, and they have passed.