Revert "pull upstream?"

This reverts commit 8150230740231d1e2933f96a77ab942745b64175.
nil will return 0 here so this check is sufficient enough
refactor to use indexOfObjectPassingTest:
simpler terary expression
initialize property and remove extra braces
return CWPriorityQueue item so subclasses can potentially be used
remove extra brackets
refactor -countOfObjectsWithPriority: to be simpler
add *ErrorCode onto the end of the error codes to be descriptive
Committing massively from Xcode.
remove the data structure class files
remove the classes from the project
added Zangetsu-Data-Structures submodule
replace usage of CWBOOLString()
add Data Structure Classes back in
updated Zangetsu data structures
use OSAtomicIncrement64() in label
adding note about submodules
remove CWAssertV
remove CWZeroLengthAssert