Basic project setup fixes

I bet you guys forgot about me by now! Surprise!

I tried setting up OpenCongress today on a Ubuntu 14.04 VM. It's going okay so far (wrangling to get all the data imported, right now).

For the most part, the instructions were pretty good, but I rewrote them to use `rbenv` instead (since the default Ubuntu ruby version changes frequently) and some of the package names have changed.

There was one bug in the initial schema import -- it wasn't using the configured postgres user. And, although the command failed, ActiveRecord thought the migration went well. So I made it fail noisily.