Create homebrew formula

[shazron]

To submit to Homebrew: http://mxcl.github.io/homebrew/

[shazron]

Submitted to homebrew: Homebrew/legacy-homebrew#19779

[shazron]

Submission rejected because the compiler is hard-coded to gcc. Need to read the CC env var in the Makefile, then re-open the issue

[shazron]

At this point, I'm not bothering with homebrew support because of the time-consuming review process. WIll revisit. Everything is in npm now.