Merge branch 'feature/dualminer-support' into feature/gridseed-dualminer-support

* feature/dualminer-support:
  dualminer: Support for mining both Scrypt and SHA2 using DualMiner GC3355 thumb sticks Set clock frequency using --set-device dualminer:clock=frequency (default is 850 in Scrypt mode) Mine Scrypt2 and SHA2 simultaneously with two miner processes using --dual-mode (SHA2 process must be launched first)
  miner: scan for low level devices even if --scrypt is specified by the user (to detect Scrypt ASICs)

Conflicts:
	AUTHORS
	Makefile.am
	gc3355.c
	gc3355.h
	miner.c