Addresses issue 2171. Adds the @Resource annotation to ImageBundle and deprecates the old @gwt.resource javadoc pseudo-annotation. Includes updated javadoc, samples, and a bonus class "UnitTestTreeLogger" that makes it easier to unit test behavior with respect to logging.

Patch by: bruce
Review by: bobv

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2101 8db76d5a-ed1c-0410-87a9-c151d255dfc7