PagedtableExample should not be included in the Add-on

[stevebor1]

I have updated to the latest Vaadin 8 version and now a UI is being included by way of this add-on.
It looks to be the pagedtableexample with the servlet name MyUIServlet.

[novotnymartin]

The example conflicts with our servlet, preventing us from migrating to Vaadin 8.