Propogate property min/max (#1379)
Propogate property min/max (#1379)

This updates the gateway side min/max with new values if the
adapter side changes. This was needed to support color temperature
from bulbs which present the min/max as attributes which need to
be read.
mozilla-iot/gateway,mozilla-iot/gateway,moziot/gateway,moziot/gateway,mozilla-iot/gateway,moziot/gateway,mozilla-iot/gateway,mozilla-iot/gateway