Ideas for automating deployment

This one isn't ready to merge yet, but I wanted to give a preview of what we're working on to see if this is something you'd be interested in adopting.

We've added
* an option to start congress-forms in EC2 via vagrant so that we can create an integration environment in our build process
* packer to generate an ami with congress-forms installed as a service for EC2 deployment

These are both pretty closely coupled to how we do our builds and deployments, so let me know if you're interested in taking either of these upstream so we can strategize how to maintain our fork.