Added a few more datasets. None trained well.
I'm now thinking the Car dataset was a fluke and the backprop actually
isn't working.

I split up some functionality in backprop. I may still break it out
further and will certainly be doing some commenting. Hopefully I'll see
the bug when going through this process. The good part about our modular
project is that we can start working on the GA even if we don't have
backprop pegged down.