Ignore everything under buildroot
Download and unzip SteamOSInstaller.zip into BUILD
Remove everything under buildir, and let gen.sh download and unzip the SteamOSInstaller.zip, this will free up a lot of binaries out of the git repo and allow for porting of updated SteamOSInstaller.zip files
Ignore any iso files and SteamOSInstaller.zip file so it's not included in the repo
ignore md5sum file
Be more verbose on running, generate md5sum.txt for only buildroot dir, properly replace testing dir
Merge pull request #11 from ecliptik/lean

It's a big commit, but I should probably accept this before continuing to hack on things
Ignore everything in the buildroot dir
Have gen.sh make the BUILD dir and ignore it with git since it will be generated everytime gen.sh is run