Also change use of setClearColorHex to setClearColor.

rawgithub.com and raw.github.com serve files with different MIME types.  Chrome doesn't treat the MIME type served from raw.github.com as executable JavaScript, so the sample code provided in Creating-a-scene.html fails.  This patch changes the requested URL to make the sample code run correctly in all browsers.

added break tags

updated documentation for constructor argument

added documentation for undocumented methods: add, addColor, addScalar, multiply, multiplyScalar, equals, lerp, getStyle, setStyle, setHSL, offsetHSL, getHSL.

removed documentation for methods that don't exist: getContextStyle, setContextStyle 

Removed reference to ColorUtils, which no longer exists.

Added descriptions of most parameters.