generics: CasManager.getCasInterface

[Jörn Kottmann]

Right now its declared as

AbstractCas getCasInterface(CAS cas, Class<? extends AbstractCas> 
requiredInterface);

but I think it should be

<T extends AbstractCas> T getCasInterface(CAS cas, Class<? extends 
AbstractCas> requiredInterface);

I will change it if there are no objections.

Jörn