Fixes Issue #1030.
Converts Tree's internal images to use an ImageBundle and deprecates
setImageBase and getImageBase (though they still function properly for
backwards compatibility). It also adds an example to the doc to illustrate
how to override Tree's default images.

Review by: bruce



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1053 8db76d5a-ed1c-0410-87a9-c151d255dfc7
7 files changed