xbean-finder: ClassFinder

[David Blevins]

So added a finder for searching for classes that have a specific  
annotation, etc.  It's there it works and is better than some of the  
code i've seen that does the same, but... I still hate it as like all  
the approaches I've seen it loads the classes and uses reflection to  
determine if the annotation is present.

This is the most insecure code I can think of, so I'm yanking it in  
leu of an asm-based approach.  So take this as your warning not to  
start consuming the ClassFinder just yet.

-David