Add support for force deletion of the stored cc.HashElements in cc.ActionMangager when calling removeAllActionsFromTarget. This solves an issue where actions create with cc.RepeatForever.create would not leak in the ActionManager when the target object never receives another call to its update() method. This could happen when the parent object got destroyed but the child kept a reference to its parent. Resulting in a circular reference causing the parent to leak with the target of the action, which could potentially leak the whole game. Games which are affected by this leak should call cc.ActionManager.removeAllActions() when their state is being reset / or they are relaunched