Set up Travis CI to automatically build binaries for different platforms

[cweagans]

Linux and Mac are easy on Travis. Windows is a bit harder unless you've got some straightforward way to do cross compilation from Linux. Even if Windows binaries were not available right out of the gate, having Mac and Linux binaries would be an awesome step in that direction!

[haata]

We're slowly trying to move everything over to the configurator. This utility is a bit of a pain to package (even with appveyor).

Though it's all doable :D