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.
not sure if we want to add this method... even if **probably** only VRaptor's core 
implements this interface. We can add the `getMethodAnnotation` into`ControllerFound` 
event instead of implementing it on `DefaultControllerMethod`. What do you think?