Update grunt-contrib-less to v0.11.0.

package.json

@@ -43,7 +43,7 @@
     "grunt-contrib-cssmin": "~0.9.0",
     "grunt-contrib-jade": "~0.11.0",
     "grunt-contrib-jshint": "~0.9.2",
-    "grunt-contrib-less": "~0.10.0",
+    "grunt-contrib-less": "~0.11.0",
     "grunt-contrib-qunit": "~0.4.0",
     "grunt-contrib-uglify": "~0.4.0",
     "grunt-contrib-watch": "~0.6.0",