Refactoring.
Update the parser and unit tests to recognize subfolder tags on assets
Create and delete subfolders for layer image assets
Attempt to delete the assets' subfolders in decreasing depth
Add one more nice unit test
Tweak the parsing rule for folder names to make it clear that dots are allowed as long as they aren't at the beginning of the name; add more unit tests to verify this
Because we group together all the various subfolders, we shouldn't give up on trying to delete them when we first fail, even though they're sorted by decreasing depth. Instead, just do the simplest thing, which is to try to to delete all the folders.
Rename the parser rule goodcharanddots to goodcharsanddots
Merge pull request #190 from adobe-photoshop/iwehrman/subfolders

Basic subfolder support for layer assets