Add Darwin (OS X) Client Support

[bflad]

Official docs: http://docs.docker.io/en/latest/installation/mac/

[bflad]

Docker binary/package installation added in 0.30.0. Leaving open to add boot2docker so we can fully support platform.

[bflad]

It seems like boot2docker is finally stabilizing (development-wise) so maybe I can take a crack at a cookbook around it again.

[someara]

closing this due to age... will revisit client installation post 1.x