Bump to latest backbone version

package.json

@@ -50,7 +50,7 @@
   },
   "dependencies": {
     "almond": "~0.3.1",
-    "backbone": "1.1.2",
+    "backbone": "1.3.3",
     "backbone.browserStorage": "0.0.3",
     "backbone.overview": "0.0.2",
     "crypto-js": "3.1.2-5",