Support temperature display in F

[swamplynx]

For some reason the current code won't support temperature in F. I hacked around this issue with the following code around line 413 in the SA, but I'm sure there is a more graceful way to do it.

` case "temp":

            	def tmp = it.value.toDouble()

            	def tempValue = 9 * (tmp / 5) + 32

            childDevice?.sendEvent(name: "temperature", value: tempValue.round(1) as Integer, unit: "F", , displayed: true)`