java.util collections established. This means that IntMap becomes
HashIntMap, IntMap is now an interface that extends the standard Map
interface and a new Collections class is provided that allows one to
create a synchronized wrapper around an IntMap.
git-svn-id: https://samskivert.googlecode.com/svn/trunk@318 6335cc39-0255-0410-8fd6-9bcaacd3b74c