Second attempt at a good Mac OS X Mavericks/Homebrew build.

Ive made basically the same patches as before but this time I made sure that the changes won't break the Win or Linux platform builds.  The majority are Mac/Homebrew specific with the exception of the minor change to net.cpp which is taken from a patch the the original NovaCoin and other derivative coin source trees.

The build process for Mac is based on the mac build for BitCoin-Scrypt Coin which is very well documented.  The reference is: http://theotherbitcoin.com/downloads/ following the Mac instructions at the bottom of the page.
Other platforms' build docs are provided as well for Gitian builds.

Unfortunately Gitan will never be used to build the Mac release as it just isn't capable of doing so. It is Win and Linux only.