[Toybox] filesystem note and test images

[Conroy, Bradley Quentin]

I posted my filesystem notes to a google docs spreadsheet at:
https://docs.google.com/spreadsheet/ccc?key=0Aj5C85KHF6xBdDRBaDZSMWVZZGg4NWFDM0F3SFRlR0E&usp=sharing
Anyone feel free to edit if your favorite filesystem is missing/wrong.  I have exhausted
my set of test images at this point.

You can grep -aob to find the offset of a known string (useful for utf8 labels)
many of the magics are strings too, for instance squash's 0x73717368 becomes
"hsqs" (translate 2 bytes at a time backwards)

I have also attached a tarball of some compressed images that I used for testing.

R,
Brad
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