Add the squish text mixin for hiding text in inline elements.

frameworks/compass/stylesheets/compass/typography/text/_replacement.scss

@@ -31,3 +31,12 @@
   white-space: nowrap;
   overflow: hidden;
 }
+
+// Hides text in an element by squishing the text into oblivion.
+// Use this if you need to hide text contained in an inline element
+// but still have it read by a screen reader.
+@mixin squish-text {
+  font: 0/0 serif;
+  text-shadow: none;
+  color: transparent;
+}