Feature/travis

Hi Chris,

I added support for https://travis-ci.org/.  Travis CI is a hosted continuous integration service. This pull request adds the file .travis.yml . If the project is registered with travis, it will build schism on a VM.

And it adds a fancy button to your readme.md which you can marvel at here in my feature branch ;-)
https://github.com/bernstein/schism/tree/feature/travis

To be able to use this useful feature, you have to register schism at travis-ci.org where you log in with your github accout. This takes just a minute.