More Color work:
- Reorganize Color.coffee into three sections: utils, colorObject, ColorMap
- Add Color.stringToRGB which converts any CSS color to [r,g,b]
- Add Color.rgbLerp and Color.ColorMap.scaleColor
- Removed "Standalone" hints for removing ABM.util usage, got too large
- Added aStats to util to return min, max, avg, mid of an array
- Added two utils, aRamp, aRange, for use by Color
- Update util.lerp: If lo>hi, scaling is from hi end of range.
- Wallfollower model now uses NL's non-standard color for "brown".  Sigh.