updated hero example, added fluid example, resolved issue with tabs and fluid nav

lib/scaffolding.less

@@ -101,6 +101,7 @@ body {
   display: block;
 }
 
+
 // BASE STYLES
 // -----------
 
@@ -115,3 +116,11 @@ a {
     text-decoration: underline;
   }
 }
+
+// Quick floats
+.pull-right {
+  float: right;
+}
+.pull-left {
+  float: left;
+}