New MM firmware released for AvalonMiner 6.0, Hardware model: MM-60, Version: 601605-256e0f00

Firmware Details:
  http://downloads.canaan-creative.com/software/avalon6/mm/2016-05-11/

ChangeLog:
* Check api fifo overflow
* Add CODE_HOTBEFORE for hot notify
* Add a new package AVA4_P_SET_FREQ
* Support device hardware error
* Fix duplicate share
* Move stratum file to a lib
* Update temp check

Communicate:
  http://lists.canaan-creative.com/cgi-bin/mailman/listinfo
  IRC: #avalon @freenode.net

Documents:
  https://en.bitcoin.it/wiki/Avalon