Yeah, this is really great.
Now that it has support for pull request testing, I wonder if we should set up Travis for the framework and CMS in a similar way. The travis config for framework can test the framework standalone, and for cms can test with the cms included.
I'd suggest that we test using in-memory SQLite so as not to completely hose the Travis servers, and to keep it useful for rapid feedback on pull requests.
We can test both PHP 5.3 and PHP 5.4. It'll be Linux-only, but that's fine.
What do we think? Suitable for inclusion in core?