CesiumMath.NegativePiToPi is not a function

https://github.com/AnalyticalGraphicsInc/cesium/blob/master/Source/Core/Simon1994PlanetaryPositions.js#L93

I stumbled across this randomly. In Math.js the function is named negativePiToPi. Lowercasing the “N” resolved the error for me.

Charlie

Thanks, not sure why unit tests didn’t catch this. I’ll put in a fix ASAP.