Support interpolation for arbitrary sensor data keys

[cammoore]

Reported by rbrewer, Jan 14, 2011
Right now, WattDepot can provide interpolated values for power, energy. and carbon. However, WattDepot can store sensor data with arbitrary key value pairs. It would be good if there was a generic interpolated resource ("/interpolated"? "/generic"?) that took a sensor data attribute as a key and then performed interpolation on the values for that key. This would allow temperature data to be stored and retrieved at arbitrary time points.