#170 Add Lenovo S660 support

[Anonymous]

nikhil@nikhil-Inspiron-5520:~$ mtp-detect
Unable to open ~/.mtpz-data for reading, MTPZ disabled.libmtp version: 1.1.6

Listing raw device(s)
Device 0 (VID=17ef and PID=74f8) is UNKNOWN.
Please report this VID/PID and the device model to the libmtp development team
Found 1 device(s):
17ef:74f8 @ bus 3, dev 11
Attempting to connect device(s)
PTP_ERROR_IO: failed to open session, trying again after resetting USB interface
LIBMTP libusb: Attempt to reset device
LIBMTP PANIC: failed to open session on second attempt
Unable to open raw device 0
OK.

[Reverend Homer]

Applied in git. Can you please check it out?