Automated testing using Travis-CI

You can view the tests as they're run, right after each commit, here: https://travis-ci.org/chrisdembia/simbody/builds. This is set up on my fork. You can see that the 8th test passed. To set it up on another account (user or organization), see http://about.travis-ci.org/docs/user/getting-started/. Below, next to each commit, you can see a grey x, red x, or green check, indicating if the install worked, if the tests failed, or if the tests passed, respectively.