CCTableView update, CCMenu bug fix

Since we renamed gles20 branch to master.
Please discuss in this Pull Request. 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.