Tweaks on the operation center, added async command for regular use.
Minor layout optimizations.
Added Foundation spec for extending classes like NSArray, NSDictionary etc.
Responder chain business was not adding much to the system. Sorry, Saul.
Abstracted dictionary block methods to work on all key-value attributes of an NSObject.
Refactored out the 'command'. Just alloc/init an operation and queue it.
Renamed completion to feedbackBlock in order to prevent confusion with NSOperation's existing completionBlock