[Yaffs] Newly created unyaffs tool

list:
So many people ask for a tool to extract files from a yaffs file
system image. But it seems no such tool serve the purpose
deliberately. So I determined to create one. Now I have a workable
version. It can only extract yaffs2 image file at this time. I will
keep on improving it.

Here is the project page:
http://code.google.com/p/unyaffs/

Have fun!
Kai Wei