Huohua/HHRouter — pull request #1 by jeslyvarghese (2014-03-20 08:21:34+00:00)
Title: @synchronized is replaced by GCD dispatch_once

GCD dispatch_once is cleaner, faster, awesome and recommended by apple. :beer:

http://stackoverflow.com/questions/9119042/why-does-apple-recommend-to-use-dispatch-once-for-implementing-the-singleton-pat