add clamping to hsl and hsla functions

lib/less/functions.js

@@ -14,7 +14,7 @@ tree.functions = {
     },
     hsla: function (h, s, l, a) {
         h = (number(h) % 360) / 360;
-        s = number(s); l = number(l); a = number(a);
+        s = clamp(number(s)); l = clamp(number(l)); a = clamp(number(a));
 
         var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
         var m1 = l * 2 - m2;

test/css/functions.css

@@ -13,6 +13,7 @@
   saturate: #203c31;
   desaturate: #29332f;
   greyscale: #2e2e2e;
+  hsl-clamp: #ffffff;
   spin-p: #bf6a40;
   spin-n: #bf4055;
   luma-white: 100%;

test/less/functions.less

@@ -17,6 +17,7 @@
   saturate: saturate(#29332f, 20%);
   desaturate: desaturate(#203c31, 20%);
   greyscale: greyscale(#203c31);
+  hsl-clamp: hsl(380, 150%, 150%);
   spin-p: spin(hsl(340, 50%, 50%), 40);
   spin-n: spin(hsl(30, 50%, 50%), -40);
   luma-white: luma(#fff);