monitor: Sensors not formatted

[Alan Noble]

Sensors are not formatted according to the user-specified format function, i.e., round, round1, etc.

[David Sutton]

What are the intended formats bool, hex, and compass?

ISTM that the issue is arising from monitor.go:250

sensorData := sensorData{
            Name:   sensor.Name,
            Units:  sensor.Units,
            Scalar: fmt.Sprintf("%.2f", value),
            Date:   time.Unix(scalar.Timestamp, 0).In(fixedTimezone(tz)).Format("Jan 2 15:04:05"),
        }

Where all formats are given to 2 decimal places. I suggest implementing a method of iotds.Sensor called FormatSensor which returns a string for a given float based on the format in s.Format.

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