Simplify a method implementation.
Neaten logging code.

Remove an arbitrary call to +[ZJFileUtil sha1:].
Label logged asset map and SHA-1 hash value.
Return nil on error in +[ZJFileUtil sha1:].
Alphabetize files in XCode project navigator.
Adjust comments.
Clarify an assertion.
Log warning messages.
Log more warnings.
Check for unexpected number of keys in XML node.