add missing properties of cp.CircleShape

#1048 
I believe this doesn't work correctly, JSB_shapeUpdate have been bound to `cp.shapeUpdate`

```
JS_DefineFunction(cx, chipmunk, "shapeUpdate", JSB_cpShapeUpdate, 3, JSPROP_PERMANENT | JSPROP_ENUMERATE );
```

So, please find a way to mapping these functions.

`cp.shapeUpdate` to `cp.Shape#update` and `cp.Shape#cacheData`

Though it's still strange the API design of Chipmunk.js