README: Remove incomplete and unnecessary list of ASIC/FPGA devices
README: Bitstreams no longer included with BFGMiner source
Merge commit '237563b' into bfgminer-3.5.x

Conflicts:
	README
Merge branch 'rm_bitstreams' into bfgminer-3.5.x
README: Update to reflect state of autodetection in 3.5