Clean up mail sample app; simplify table refresh for selection changes

Review at http://gwt-code-reviews.appspot.com/324801

Review by: jgw@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7890 8db76d5a-ed1c-0410-87a9-c151d255dfc7
8 files changed