Fixes to some of the site look & feel.

Replaced the favicon with the idealabs logo.

Added the old TDF description image to the home page with buttons to
navigate to standings, login, and signup.

Added a footer with the idealabs logo and a link to the idealabs site.
testagents.py script working again.

Bug fixed where it didn't know how to get the value for an existing
composition containing only cash.
Scaffolding of history generation created.