Fix pgweb Upstart start on stanza

There are no shared folders on the `services` virtual machine, so using
`vagrant-mounted` isn't a great option.
Adjust static asset handling by Nginx to accommodate Django

This changeset alters the way static assets are served by Nginx. Static
assets emitted by Django and prefixed with `/static/` are handled by a
specific `location` block that creates an alias to
`{{ app_home }}/collected_static`.

Attempts to resolve #78.
Merge branch 'feature/hmc/nginx-static' into develop
Merge branch 'feature/hmc/pgweb-upstart' into develop
Use decorators from django-tinsel
Replace is_logged_in with builtin Django decorator
Add support for retrieving a forgotten username.

Templates were mostly copied from OTM2, with some text changes where
appropriate.
Make the login screen send users to their profile
Add UI tests for the registration, and forgot password workflow