Merge pull request #3 from bswinnerton/master

Cd to /tmp/ before curling installer_tools
use /home/joe variable
we need to install git before updating homebrew
only install mac tools if we have to
we must upgrade rubygems before proceeding
install homebrew before rvm; cleaning up
no wget in mac install, again
using vagrant to test out linux installs for now
apt-get update before anything
uninstall will help make this process repeatable
reload bashrc before finishing
let's skip homebrew for now
last ditch efforts
closes #4; fixing typo
closes #5; fixing GCC v2
closes #6; logic was wrong for gcc installation; changed to check for xcode instead