AWS migration

[justinanderson]

Makes vagrant up build whole site that matches the production environment.

• Uses Nginx and Gunicorn instead of Python's runserver and stunnel.
• Adds several helper scripts to hopefully ease the learning curve on Docker.
• Generates a self-signed cert so HTTPS works out of the box on new setups.
• Changes documentation to say that Vagrant is the recommended way of working with DataHub.

[RogerTangos]

Everything looks in place to me. Thank you for updating the documentation. My main reservation is that we're not prompting the user to update their `SECRET_KEY in settings.py. If we're advertising that all they need to do is clone and vagrant up, it seems wise to ask them to provide some entropy.

That aside, seems good. Is that a change you'd like to make, or should we leave it for the next pull request?

[justinanderson]

@RogerTangos Good point. I'll add a SECRET_KEY generator step.

[RogerTangos]

Thanks!

[justinanderson]

Should be all set now.

[RogerTangos]

Looks good. Thanks for storing the key in a seperate file.