[patch] support 14bit NEF

[Rafael Espíndola]

> Works fine. Applied.
>
>
> Still one detail left over: why does the size of the picture get offset?

On NEFs the raw_width not being the same as width you mean? Some NEF
files have some form of padding. That and some unit tests for the
classes I have added is next on my todo list.

I will be out until the 13th of August (taking photos instead of
processing them :-) ). Will work on it when I get back.

>
> Hub

Cheers,
Rafael