Try to provide a means to proxy generics

```
Perhaps make a new ProxyFactory.proxy(???) method that takes some kind of 
TypeToken or SuperTypeToken or whatever is needed.  For the issue involved see: 
ProxyMethodHandler.returnTypeIsGenericTypeVariable() notes.
```

Original issue reported on code.google.com by `kandpwel...@gmail.com` on 25 Aug 2013 at 4:01
