DamegeNum related

1.add function in the B2CCNode which can make this node show damege num
on its m_visualnode
2.createDamegeNum was trigger in by the ObjectModel objects its hold.(I
think this is NOT (the best and the simplest) way!!)
Enhance the B2CCNode

1. add a new vitual function : onB2NodePostionChanged which could be
triggered by setB2Nodeposition, write the sub class's logic in the
onB2NodePostionChanged function you want.
2. make a test in the RigidBlock
Enhance on the ForeScenemanager

1. trying to make a config able ForeScenemanager which can generates the
Blocks, Monsters, Edges by reading this Scene's config, also providing
some kinds of randomicity.
RapidXml related