Backprotpagation of changes inside Device to Devices

[eirenik0]

If we want to save availability to delete devices from the device object itself we have to notify about this change parent object. It'll update the internal devices list.

While calling to api.devices.delete_device("Dev name") track all changes but call of api.devices['Dev name'].delete() wont track. At this point we won't have device object in facecast dashboard but it still would be exist inside api.devices.