Merge Composite Operations into one #1
Merge Composite Operations into one #2
Merge Composite Operations into one #3
operation -> operationWithBlock:
Introduce new -[COCompositeOperation operation:] method
-[COCompositeOperation compositeOperation:withBlock:]
-[COCompositeOperation compositeOperation:]
Minor cleanups
Rewrite docs
Remove confusing words 'transactional' and 'cascade'