Redeploy testnet contracts with ATXish params

[willyogo]

Update the following in the nouns contracts and/or UI:

DAO Name: ATX Nouns
DAO Symbol: $ATX
Auction duration: 3 days (hold off on setting this one until launch so we can keep it short during testing)
Auction reserve price: 0.00512 ETH
Name of the NFT displayed in the Auction UI should be "ATX Noun #"

Replace "Nouns" with "ATXNouns" in all of the contract names

[JacobHomanics]

Good to close this one?