add sass/scratch.scss and associated sass files

Resources/public/sass/contrib/bourbon/helpers/_radial-positions-parser.scss

@@ -0,0 +1,18 @@
+@function _radial-positions-parser($gradient-pos) {
+  $shape-size: nth($gradient-pos, 1);
+  $pos:        nth($gradient-pos, 2);
+  $shape-size-spec: _shape-size-stripper($shape-size);
+
+  $pre-spec: unquote(if($pos, "#{$pos}, ", null))
+             unquote(if($shape-size, "#{$shape-size},", null));
+  $pos-spec: if($pos, "at #{$pos}", null);
+
+  $spec: "#{$shape-size-spec} #{$pos-spec}";
+
+  // Add comma
+  @if ($spec != "  ") {
+    $spec: "#{$spec},";
+  }
+
+  @return $pre-spec $spec;
+}