Fix OSX CI failures
Fix OSX CI failures

[Brew released 1.0.0][1] today and in true major release fashion it
broke our OSX CI builds.

[1]: http://brew.sh/2016/09/02/homebrew-1.0.0/

am11/libsass,am11/libsass,am11/libsass,am11/libsass,am11/libsass