Fix a bug inside setSelectedIndex: method of RDVTabBarController.
Fix a bug inside setSelectedIndex: method of RDVTabBarController.

kohtenko/RDVTabBarController,waynett/RDVTabBarController,gooc/RDVTabBarController,AlexanderMazaletskiy/RDVTabBarController,xuzhenguo/RDVTabBarController,wayne798/RDVTabBarController,faimin/RDVTabBarController,justinyaoqi/RDVTabBarController,various/RDVTabBarController,xuanyi0627/RDVTabBarController,spbreak/RDVTabBarController,blmyself/RDVTabBarController,keyeMyria/RDVTabBarController,bpc/RDVTabBarController,jiqiuyucool/RDVTabBarController,SilverBulletZyp/RDVTabBarController,robbdimitrov/RDVTabBarController,SummerHF/RDVTabBarController