Add storjscan wallets implementation to the satellite. The wallets interface allows you to add and claim new wallets as called by the API. The storjscan specific implementation of this interface uses a wallets DB to associate the user to a wallet address, as well as a storjscan client to request and associate new wallets to the satellite.
Change-Id: I54081edb5545d4e3ee07cf1cce3d3e87cc00c4a1
