When closing the auction Broker sets the status
Broker broadcasts currentPrice only when winner has changed.

* changed the corresponding end-to-end test
Show "Winner" as status when winner has changed.
AuctionBucket as a TopLevel class and shuffle before broadcast
Shows 'Server not ready' if failed to connect/login
Move FakeAuction as TopLevel
Extract XMPPConnection into XMPPAuctionHouse
Reorganize packages (ui, xmpp)
Add missed files from previous commit
Remove warnings (serial, not used)