Update npm packages

Author: davidpiegza

package.json

@@ -2,9 +2,8 @@
   "name": "graph-visualization",
   "version": "0.4.0",
   "devDependencies": {
-    "grunt": "~0.4.5",
-    "grunt-contrib-jshint": "~0.10.0",
-    "grunt-contrib-nodeunit": "~0.4.1",
-    "grunt-contrib-uglify": "~0.5.0"
+    "grunt": "~1.0.1",
+    "grunt-contrib-jshint": "~1.1.0",
+    "grunt-contrib-uglify": "~2.0.0"
   }
 }