Push logic for connection/command & scene execution out of the Binding object and into the Connection and BindingConfig objects.
Loosen the constraints so the command: parameter can have no values (since that's the only operational model right now)
Add logic to the Connector to build the complete URL needed to invoke a Scene, or an Action call on a Device
... just, don't actually start that URL running... just yet.

This enables:
a) Testing of Scene-based config, using ",command:" parameter
b) Testing of Device-based config, using ",command:" parameter (ON/OFF and TOGGLE) commands build the right "internal-default" type of URL.

In both cases, they just build the URL, not actually fire it off (yet!)

Baseline checkin, so I can build the next layer.