Reduce warnings in Eclipse:
o Use <?> instead of raw types
o Add some @SuppressWarnings annotations
o Document or remove unused method parameters

Review at http://gwt-code-reviews.appspot.com/219803

Review by: jat@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7749 8db76d5a-ed1c-0410-87a9-c151d255dfc7