2.21 released

[Stephen Haberman]

Hi,

Andrzej Czajewski noticed that the generated BindKeywords file did not
have a SuppressWarnings("all") in it, and sent in a patch, so I released
2.21 this morning.

Also note I included a small fix where, while running the examples tests
anyway, Eclipse was returning "java.util.Map<K, V>.Entry<K, V>" as the
type of Map.Entry, which caused compile errors in several places. I'm
not sure why/when this started happening. If anyone had problems with
something similar, try 2.21 to see if it fixes it, and let me know if
it doesn't.

Thanks,
Stephen