Feature request: Recursive mode or Sub-namespace list

Hello there,

I took the library for a spin and found out that it work, but only if the specific namespace of a given class is known.

My use case is that I would like to clean up the doctrine annotation cache for all classes. I know the base namespace, but I would hate to go thru and list all sub-namespaces. I would need to go thru all classes in a certain namespace and all sub-namespaces to clear it all.

It could be a neat feature to have.