Add basic support for datasync views

Still no actual daemon wired up yet, but can fake it for UI with this

rattail_demo/web/views/__init__.py

@@ -33,6 +33,7 @@ def includeme(config):
     # main table views
     config.include('tailbone.views.brands')
     config.include('tailbone.views.customers')
+    config.include('tailbone.views.datasync')
     config.include('tailbone.views.departments')
     config.include('rattail_demo.web.views.email')
     config.include('rattail_demo.web.views.employees')