Add bottle support

[nex3]

Currently this formula only supports building from source. It would be nice to set up a system for building bottles (that is, binary packages). It should be possible to have a Travis OS X bot that creates a bottle every time we push a change to the formula.

Unfortunately, writing and testing the code for such a bot requires a Homebrew installation, which requires an OS X machine, which I don't have. I'll either need someone else to set up bottling, or someone who's willing to work closely with me to test code I write.

[sandangel]

homebrew now supports linux as well. If you still need help please let me know