Pushed to version 0.1.8. Details in changelog. (Makefile, FontAwesome, sass)

assets/sass/lib/bourbon/functions/_px-to-em.scss

@@ -0,0 +1,13 @@
+// Convert pixels to ems
+// eg. for a relational value of 12px write em(12) when the parent is 16px
+// if the parent is another value say 24px write em(12, 24)
+
+@function em($pxval, $base: $em-base) {
+  @if not unitless($pxval) {
+    $pxval: strip-units($pxval);
+  }
+  @if not unitless($base) {
+    $base: strip-units($base);
+  }
+  @return ($pxval / $base) * 1em;
+}