Bugfix: sysfs autodetect: Continue searching even after finding one tty (fixes multiple ttys per device, such as some Cairnsmore1s)
Bugfix: cairnsmore1: Enable building with libudev autodetection even if only icarus drivers are enabled
README: Document serial device format for Mac OS X
Merge commit '998a995' into bfgminer-3.0.x
Merge commit 'b80b96b' into bfgminer-3.0.x
Merge commit 'b5aa45e' into bfgminer-3.0.x