Fixing issue #61. Now the controller doesn't get stuck anymore if the notification center is pulled down while panning.
Fixing issue #61. Now the controller doesn't get stuck anymore if the notification center is pulled down while panning.

duanhjlt/PKRevealController,cnbin/PKRevealController,BlessNeo/PKRevealController,wjszf/PKRevealController,RyanTech/PKRevealController,AlanJN/PKRevealController,SuPair/PKRevealController,emodeqidao/PKRevealController,adonoho/PKRevealController,ramoslin02/PKRevealController,chengkaizone/PKRevealController,pengleelove/PKRevealController,adonoho/PKRevealController,libiao88/PKRevealController,SanChain/PKRevealController,nitxc/PKRevealController,wubangjunjava/PKRevealController,xiaotaijun/PKRevealController,SummerHF/PKRevealController,wayne798/PKRevealController,hanangellove/PKRevealController,policp/PKRevealController,leasual/PKRevealController,chieryw/PKRevealController,adonoho/PKRevealController,pkluz/PKRevealController,xingyuniu/PKRevealController,AbooJan/PKRevealController,andyFang1688/PKRevealController,wpostma/PKRevealControllerWP