Java6 Support

[Dain Sundstrom]

I fixed the compile and test errors on Java6.  The really confusing  
thing is that OpenEJB just seems to run on Java6 without complaint  
even though DBCP hasn't been updated for the new JDBC apis in Java6.   
I expected the VM to throw verifier errors, but it doesn't.  Guess I  
don't really understand the VM yet.

I'm going to test the 3.0-beta-1 release to see if it runs on Java6.   
If it does, we can remove the disclaimer from our download page.

-dain