Updated ar-drone dependency from 0.2.0 to 0.2.1 to get GPS data.

package.json

@@ -17,7 +17,7 @@
     "artificial horizon"
   ],
   "dependencies": {
-    "ar-drone": "0.2.0",
+    "ar-drone": "0.2.1",
     "express": "3.0.x",
     "ejs": "~0.8.3",
     "socket.io": "~0.9.4",