Thank you for your kind words, they're very humbling and flattering for us, and they are what keep us going. It's a great boost for us that people suggest GitHub should buy us. Thank you!

Thank you for your suggestions as well, it's something we've been thinking about ourselves as well, independently of whether it's a part of GitHub or an independent project/product.

We've been working hard on making Travis CI available for building private GitHub repositories, and we're coming along quite nicely. Stay tuned! :)

Mathias/Travis CI