Lots of little fixes, some minor library updates - see commit log for specifics. Better compatibility with 1.6.7+ (but using Arduino 1.6.5r2 or earlier is highly recommended!)
Please see install instructions:
Digispark: http://digistump.com/wiki/digispark/tutorials/connecting
Digispark Pro: http://digistump.com/wiki/digispark/tutorials/connectingpro
DigiX: http://digistump.com/wiki/digix/tutorials/software
Windows users using Arduino 1.6.6 or higher you must install the drivers manually: https://github.com/digistump/DigistumpArduino/releases/download/1.6.7/Digistump.Drivers.zip