Fixing macro for changed method signature for imp_implementationWithBlock(), which actually depends on Xcode version (and thus a check for either __IPHONE_6_0 or __MAC_10_8 to be defined,regardless of the deployment target
…comma-delimited content types
…ly scheduling the stream on a runloop.
…ation queue singleton Initializing operation queue with NSOperationQueueDefaultMaxConcurrentOperationCount
Assorted copy edits and reformatting to documentation