Remove unneeded quotes
Add GitHub API token for Homebrew

This allows Homebrew to search GitHub as often as needed for packages.
Without it, GitHub only allows a few searches a day, and this limit can
be quickly reached.
Add script to start TFTP server

This is most helpful for OS X, when the TFTP server isn't always started
by default.
Add a simple Makefile to automate setup tasks

This doesn't automate all of the setup tasks, but it does do an okay job
with the symlinks.