Expose the Units of Measure views in web app

also this declares the CORE-specific product handler to be our default

rattail_demo/web/views/__init__.py

@@ -33,6 +33,7 @@ def includeme(config):
     config.include('rattail_demo.web.views.upgrades')
     config.include('tailbone.views.users')
     config.include('rattail_demo.web.views.vendors')
+    config.include('tailbone.views.uoms')
 
     # purchasing / receiving
     config.include('tailbone.views.purchases')