Add the basics for decoding "naked" raw files
These are the crazy files that things like CHDK create where there is absolutely no preamble and the whole file is just the raw data. dcraw identifies them just based on exact file size and we do the same here.
Remove dead code and printfs
Add more of the CHDK raw cameras
Merge pull request #657 from pedrocr/rawspeed-chdk-support

Rawspeed CHDK raw support