Adds non-trivial tests to the default app created by webAppCreator, including one that uses delayTestFinish and sends an RPC.  Also shows an example of shared client/server code.

Patch by: jlabanca
Review by: jgw



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7362 8db76d5a-ed1c-0410-87a9-c151d255dfc7