Run tests on travis

[shalupov]

I've wrote a simple .travis.yml file for testing compiler on Travis CI: https://travis-ci.org/
Build status is green for my fork: https://travis-ci.org/shalupov/8cc/branches

Enabling this will automatically run tests for every commit and also for every pull request.

For enabling travis for your project you just need to log in with GitHub account on https://travis-ci.org and enable it for the repository.

[andrewchambers]

To be honest, I wish travis didn't require code to be in the repo to work, in general I feel like the code will outlive the travis ci company.

[shalupov]

Yep. On the other hand, it works as documentation how to run tests as well. I wish the format was not travis dependent.