RangeError using math.map

[fusepilot]

Everytime I use math.map I forget that I need to clamp the input val and get a RangeError. So I need to write this currently:

var currentFrame = 0;
var startFrame = 10;
var endFrame = 20;
var clampedFrame = mout.math.clamp(currentFrame, startFrame, endFrame);
var result = mout.math.map(clampedFrame, startFrame, endFrame, 0, 100); // result == 0

instead of simply:

var currentFrame = 0;
var startFrame = 10;
var endFrame = 20;
var result = mout.math.map(currentFrame, startFrame, endFrame, 0, 100); // result == 0

There was a little discussion on this in #199.

I know its not technically correct, but can we remove the RangeError that is causing this in math.norm? Or, if that is too much of a philosophical problem, can we just inline the norm function without the RangeError inside of map so that norm retains its current behavior and map gets a little more robust?