chore(package.json): upgrade zone.js to v0.4.3

Closes #1457

npm-shrinkwrap.clean.json

@@ -8940,7 +8940,7 @@
       }
     },
     "zone.js": {
-      "version": "0.4.2"
+      "version": "0.4.3"
     }
   },
   "name": "angular",

npm-shrinkwrap.json

@@ -13794,9 +13794,9 @@
       }
     },
     "zone.js": {
-      "version": "0.4.2",
-      "from": "zone.js@0.4.2",
-      "resolved": "https://registry.npmjs.org/zone.js/-/zone.js-0.4.2.tgz"
+      "version": "0.4.3",
+      "from": "zone.js@0.4.3",
+      "resolved": "https://registry.npmjs.org/zone.js/-/zone.js-0.4.3.tgz"
     }
   }
 }

package.json

@@ -35,7 +35,7 @@
     "systemjs": "^0.9.1",
     "traceur": "0.0.87",
     "which": "~1",
-    "zone.js": "0.4.2"
+    "zone.js": "0.4.3"
   },
   "devDependencies": {
     "angular": "1.3.5",