Add new NSJSONSerialization extension.
API Change: NSFileManager+RFKit, fileSizeForPath: will return -1 if error occurs.
UIView+RFKit add animateWithDuration:delay:options:animated:beforeAnimations:animations:.
Document improve.
NSNumberFormatter+RFKit add formatedFileSizeStringWithBytes:useBinaryUnites:.
Fix warning: dout, no previous prototype for function.
RFFeatureSupportProxyDelegates add new declarations.
Bug fixes: DEBUG not defined for release scheme.
Header unify: Hello 2013 and repository url change.
Document improve.
Add new UIWebView extension.
NSJSONSerialization+RFKit, add method cover json string to object.