1st commit

css/sass/bourbon/helpers/_shape-size-stripper.scss

@@ -0,0 +1,10 @@
+@function _shape-size-stripper($shape-size) {
+  $shape-size-spec: null;
+  @each $value in $shape-size {
+    @if ($value == "cover") or ($value == "contain") {
+      $value: null;
+    }
+    $shape-size-spec: "#{$shape-size-spec} #{$value}";
+  }
+  @return $shape-size-spec;
+}