Updare grunt-jekyll dependency

package.json

@@ -30,7 +30,7 @@
     , "grunt-contrib-uglify": "~0.2.4"
     , "grunt-contrib-watch": "~0.5.3"
     , "grunt-html-validation": "~0.1.5"
-    , "grunt-jekyll": "~0.3.9"
+    , "grunt-jekyll": "~0.4.0"
     , "grunt-recess": "~0.4.0"
     , "browserstack-runner": "~0.0.12"
   }