Implements a reduced scope ValueStore. It's responsible for posting change events
to the event bus, and for collecting changes to domain objects. You can tell
it's working because the editing feature of the Expense app now actually
refreshes its table.

Review at http://gwt-code-reviews.appspot.com/290801

Review by: amitmanjhi@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7826 8db76d5a-ed1c-0410-87a9-c151d255dfc7
42 files changed