chore: upgrade zone.js to v0.6.6

Closes #7730
Closes #7737

npm-shrinkwrap.clean.json

@@ -5832,7 +5832,7 @@
       }
     },
     "zone.js": {
-      "version": "0.6.5"
+      "version": "0.6.6"
     }
   },
   "name": "angular-srcs",

npm-shrinkwrap.json

@@ -9304,8 +9304,8 @@
       }
     },
     "zone.js": {
-      "version": "0.6.5",
-      "from": "zone.js@0.6.5"
+      "version": "0.6.6",
+      "from": "zone.js@0.6.6"
     }
   }
 }

package.json

@@ -35,7 +35,7 @@
     "es6-shim": "^0.35.0",
     "reflect-metadata": "0.1.2",
     "rxjs": "5.0.0-beta.2",
-    "zone.js": "^0.6.5"
+    "zone.js": "^0.6.6"
   },
   "devDependencies": {
     "angular": "^1.5.0",