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Fix crash when WeMo devices are powered off (#794)

* Big Update

Includes:
 - New lookup node to check state of a device
 - Fix dimming control for lights
 - Fix light group control
 - Set the node label to match the device name
 - The event now includes the text description of the light capability

* Add extra check for empty results in discovery

* Attempt to catch errors from wemo-lookup

This is to catch errors when device is offline

* Put request back

Will look at making it all http.request later

* Add more error handling and reporting

* Try and not crash with subscriptions

Failed subscriptions will try agian in 1 min

* Fix some messages

* Remove most of the console.logs

* Last of console.logs

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