bootstrap 3.2 upgrade

public/css/lib/bootstrap/scaffolding.less

@@ -20,7 +20,7 @@
 // Body reset
 
 html {
-  font-size: 62.5%;
+  font-size: 10px;
   -webkit-tap-highlight-color: rgba(0,0,0,0);
 }
 
@@ -132,3 +132,19 @@ hr {
   clip: rect(0,0,0,0);
   border: 0;
 }
+
+// Use in conjunction with .sr-only to only display content when it's focused.
+// Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+// Credit: HTML5 Boilerplate
+
+.sr-only-focusable {
+  &:active,
+  &:focus {
+    position: static;
+    width: auto;
+    height: auto;
+    margin: 0;
+    overflow: visible;
+    clip: auto;
+  }
+}