[fprint] fprint storage

[Vasily Khoruzhick]

Hi, here's first implementation of storage.

Still dirty - there's no uid check.
Only simple file storage implemented. Fingerprints for each user stored 
in /etc/fprint/<username>/<device_id>/<device_type>/<finger_num>

There's still much work to do, and this patch is my basic vision of fprint 
storage.

Also here's patch for libfprint to compile it with latest libusb-1.0 ;)

Regards
Vasily
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