awsboxen deployment script

(This PR is against the "sometests" branch, because I did a bit of file-moving and didn't want to create merge problems)

Adding a basic awsboxen deployment and docs on how to run it.  This spins up a loadbalancer and fixed-size autoscale group of worker instances.  It's currently running live at http://scrypt.dev.lcip.org/

/cc @zaach for testing against the live server

@SamPenrose r?