add github hub utility
Merge pull request #8 from thegarage/add-brew-hub

add-brew-hub
Merge branch 'master' of https://github.com/thegarage/osx-bootstrap into add_box_sync

# By Ryan Sonnek
# Via Ryan Sonnek
* 'master' of https://github.com/thegarage/osx-bootstrap:
  add github hub utility