Fix BadNumberError code (#107)
Fix BadNumberError code (#107)

lamassu-machine is expecting 401 for a bad number, but lamassu-server 
was returning 410 instead.
lamassu/lamassu-server,lamassu/lamassu-server,joshmh/lamassu-server,lamassu/lamassu-server,joshmh/lamassu-server,naconner/lamassu-server,joshmh/lamassu-server,naconner/lamassu-server,naconner/lamassu-server,joshmh/lamassu-server