@ashfurrow => Retain between VC state in a single object on the Nav

This is a pattern I've used in Folio. When you have multiple VCs that can potentially jump back and forth passing lots of data between them is tricky. 

So I have a single model that represents all the known state between all the view controllers and then individual VCs can hook on to that state and pass along their signals. In the current build the PlaceBidVC passes along the bid amount.