Andrew's tasks

This pull request contains the requested bug fixes, an admin interface to check out the deals, and an interest rate feature.

The interest rate is additional information that the real-estate developers specify. It's a percentage the devs are willing to pay if their funding type has a debt component (it doesn't apply to equity-only deals). To help the devs pick a good interest rate, the app shows the average, the 5th percentile, and the 95th percentile of all the interest rates that other developers have specified for their projects. The explanation includes tips on which number to use, depending on the needs of the developer.

To see this feature in action, migrate the db and log in (as a developer), and visit an existing deal (or create a new deal). Choose any capital funding type except the default (blank) or the Equity funding type, and you will see an interest percentage label and input appear. Click on the input, an a popover with the explanation will appear.