PIVOT-916:  Make the default uncaught exception handler available as a
separate method in ApplicationContext so that user applications that
implement the Application.UncaughtExceptionHandler interface can have
access to the default implementation if they need it.


git-svn-id: https://svn.apache.org/repos/asf/pivot/trunk@1624381 13f79535-47bb-0310-9956-ffa450edef68