Add support for mapping ConstraintViolation objects into SimpleBeanEditor.
Patch by: bobv
Review by: rjrjr

Review at http://gwt-code-reviews.appspot.com/1260801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9562 8db76d5a-ed1c-0410-87a9-c151d255dfc7