Fix hue modulo operation

Author: adroitwhiz

index.js

@@ -142,7 +142,7 @@ cs.get.hsl = function (string) {
 
 	if (match) {
 		var alpha = parseFloat(match[4]);
-		var h = (parseFloat(match[1]) + 360) % 360;
+		var h = ((parseFloat(match[1]) % 360) + 360) % 360;
 		var s = clamp(parseFloat(match[2]), 0, 100);
 		var l = clamp(parseFloat(match[3]), 0, 100);
 		var a = clamp(isNaN(alpha) ? 1 : alpha, 0, 1);

test/basic.js

@@ -36,6 +36,7 @@ assert.deepEqual(string.get('rgb(100%, 30%, 90%)'), {model: 'rgb', value: [255,
 assert.deepEqual(string.get('rgb(100% 30% 90%)'), {model: 'rgb', value: [255, 77, 229, 1]});
 assert.deepEqual(string.get('transparent'), {model: 'rgb', value: [0, 0, 0, 0]});
 assert.deepEqual(string.get('hsl(240, 100%, 50.5%)'), {model: 'hsl', value: [240, 100, 50.5, 1]});
+assert.deepEqual(string.get('hsl(-480, 100%, 50.5%)'), {model: 'hsl', value: [240, 100, 50.5, 1]});
 assert.deepEqual(string.get('hsl(240 100% 50.5%)'), {model: 'hsl', value: [240, 100, 50.5, 1]});
 assert.deepEqual(string.get('hsl(240deg, 100%, 50.5%)'), {model: 'hsl', value: [240, 100, 50.5, 1]});
 assert.deepEqual(string.get('hsl(240deg 100% 50.5%)'), {model: 'hsl', value: [240, 100, 50.5, 1]});