Add queue configuration
Add handler and test for seller arrival.
SellerArrives is refactored for easier testing
Refactor User, Buyer, Seller
Modified data model working
Change name of User model to Customer
Tests pass for first 3 seller matching helpers
DRY. Consolidated Buyer and Seller helpers and tests
Move state transition code into Buyer and Seller objects
Begin SMS request handler
Remove cruft.
Add state transition code
Get naive state transitions to work for seller
Seller transitions working
Maybe found a not awful OO design
Delayed seller transitions working with new design
Rough draft of Buyer state transitions
2nd draft of buyer transitions plus buyer dispatch tables
Comment state transition methods
First draft of matching algorithm complete