Adding explicit casts and #pragma ignore to fix warnings about out-of-range enumerated type value assignment
Resolve compiler warning about "Values of type 'NSUInteger' should not be used as format arguments; add an explicit cast to 'unsigned long' instead"
[Issue #2285] Fixing potential crash caused by failed validation with nil responseData
[Issue #2284] Adding check for respondsToSelector before adding observer on dynamic keyPath
Merge branch 'master' of https://github.com/AFNetworking/AFNetworking