Add homebrew support for OS X.
Fix 0.11.8
Merge pull request #251 from jwalton/master

Add homebrew support for OS X.
Merge pull request #252 from kkoopa/unbind

Fix 0.11.8
Merge branch 'master' of https://github.com/JustinTulloss/zeromq.node
Update for Node v0.11.9