bump load-grunt-tasks to ~0.5.0

[skip validator] [skip sauce]

package.json

@@ -55,7 +55,7 @@
     "grunt-jscs-checker": "~0.4.3",
     "grunt-saucelabs": "~8.0.2",
     "grunt-sed": "~0.1.1",
-    "load-grunt-tasks": "~0.4.0",
+    "load-grunt-tasks": "~0.5.0",
     "markdown": "~0.5.0",
     "time-grunt": "~0.3.1"
   },