[fprint] New subproject: fprint_demo

[Daniel Drake]

Vasily Khoruzhick wrote:
> I think fprint_demo should support enrolling, it will be quite convenient and 
> usefull to see quality of enrolled fingerprints :)

See the README, it's already planned.. and yesterday I started writing 
the enroll interface, it's almost done.

You will not be able to view the quality of previously enrolled 
fingerprints, that data is not stored. You will be able to view the scan 
quality as you are enrolling though.

Daniel