Added Quick Start guide.

This guide could be simplified even further by placing "cd /vagrant && ./run_dev.sh" inside of the Vagrantfile. I didn't do that because the end user wouldn't see the stdout from the node, and I feel like that's still a good thing for everyone to see.. it is still a very young project and problems are bound to pop up.
Merge pull request #18 from secret-bitcoin-login/master

Added Quick Start guide.