Color.getHex() de-obfuscated.

Is not used so much anymore so we can have it with a less obfuscating syntax.

src/core/Color.js

@@ -106,7 +106,7 @@ THREE.Color.prototype = {
 
 	getHex: function () {
 
-		return ~~ ( this.r * 255 ) << 16 ^ ~~ ( this.g * 255 ) << 8 ^ ~~ ( this.b * 255 );
+		return Math.floor( this.r * 255 ) << 16 ^ Math.floor( this.g * 255 ) << 8 ^ Math.floor( this.b * 255 );
 
 	},