CCTableView update, CCMenu bug fix

Since we renamed gles20 branch to master.
Please discuss in this Pull Request(https://github.com/cocos2d/cocos2d-x/pull/1800). Thanks.

Added an optional method to the CCTableViewDelegate that informs the implementer when a cell in the CCTableView will be recycled.

Fixed a bug in CCMenu that prevented the CCMenu touch priority from being updated by a call to CCMenu::setTouchPriority(int). The CCMenu touch priority was set to kCCMenuHandlerPriority.