@1aurabrown => Place Bids

Adds the networking required to send the POST to submit a bid. Then sits at the confirmation page. Removes the `BiddingWebViewController.swift` 

Also:
* fixes #145 
* fixes #137 
* partial fix for #144
not really that sure, turns out you don't that object when you make a bid. Got to check how to figure what is the highest bidder. From memory you have to check back a second of so later to see if it's you.