Hawk's fork of Dotfriles

My fork of Dotfriles adds the following features:
 + Mac OS X support, including Homebrew for package management
 + SublimeText 2/3 support, including copying config files to the Correct Place on OS X and Linux
 + Ability to install packages from a list in `~/.dotfriles/packages.txt`

Please sanity-check my additions before merging :)
I thought the only reason the install set was in a separate script was because it needed to be run as root? Do note that my `apt-install` function just calls `dotfriles-with-sudo.sh` which I modified to install any given package. I can roll the whole install process into a separate script, though. I didn't think of that.