New version released.

0.6.6
Speed improvements: bcd - 5%
Cosmetic change: the miner will not show duplicate hashorder messages for x16r/s, bitcore, and they are no longer labeled as WARN
To disable API altogether set --api-bind-http / --api-bind-telnet to 0.
HTTP API: new control command "shutdown" to quit the miner (see help file for details)