Added validation jars to 'devmode' and 'test.dev' targets in ant webAppCreator templates
Fixes Issue 5950.

Review at http://gwt-code-reviews.appspot.com/1352807


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9736 8db76d5a-ed1c-0410-87a9-c151d255dfc7