Adding feature to configure upload size with annotation

Because there are some times we want to configure upload size with different values for another method. Or we want to configure a value without overriding a class.

If you like it, I'll add documentation.
the point is that adding this behaviour to `ControllerFound` event we avoid to break 
compatibility... but I'm not sure if we should care about this for this case, because 
**probably** only VRaptor's core implements this interface. What u think @lucascs?