Added several methods to BaseGuiceServletInjector to enable sub-classing
of modules.  Closes #137 (this commit addresses all 3 points on that
ticket)
Default views using UserNavigationTree, and a simple display of their
own name
Upgrade to Vaadin 7.1.0.  There was a change to the Converter interface,
and the introduction of the LocaleService which required some changes.
Closes #147