Use libusb_strerror to translate erro codes to strings.
Use libusb_strerror to translate erro codes to strings.

kopchik/pyusb,swinman/pyusb,h3nj3/pyusb,makerbot/pyusb,swinman/pyusb,rabryan/pyusb,AlanJAS/pyusb,makerbot/pyusb,h3nj3/pyusb,karlp/pyusb,rabryan/pyusb,karlp/pyusb,AlanJAS/pyusb,kopchik/pyusb