Closes #3

math.scss

@@ -1,16 +1,16 @@
-@function power ($x, $n) {
+@function power($base, $exponent) {
     $ret: 1;
-    
-    @if $n >= 0 {
-        @for $i from 1 through $n {
-            $ret: $ret * $x;
-        } 
-    } @else {
-        @for $i from $n to 0 {
-            $ret: $ret / $x;
+
+    @if $exponent > 0 {
+        @for $i from 1 through $exponent {
+            $ret: $ret * $base;
+        }
+    } @else if $exponent < 0 {
+        @for $i from $exponent to 0 {
+            $ret: $ret / $base;
         }
     }
-    
+
     @return $ret;
 }