Remove Apple GCC 4.2 (use CLANG only)
Use community cookbook 'homebrew'

deprecate the custom 'brew' LWRP; there's nothing
wrong with it--it has worked great these last few
years--but we're moving to using community cookbooks
as much as possible.

To add a homebrew package, e.g. git:

	package "git"

Previously was

	brew "git"

In the future the 'brew' LWRP will be removed.

Signed-off-by: Aram Price <aprice@pivotallabs.com>