Extracted the image bundle example code into a nested class, fixing a typo pointed out by Mathias Bogaert in the process. Thanks Mathias and Fred!

Patch by: fredsa
Review by: bruce

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@971 8db76d5a-ed1c-0410-87a9-c151d255dfc7