Merge pull request #168 from ember-fastboot/greenkeeper/rsvp-4.7.0

Update rsvp to the latest version 🚀

Author: rwjblue

package.json

@@ -31,7 +31,7 @@
     "debug": "^3.0.0",
     "exists-sync": "0.0.4",
     "najax": "^1.0.2",
-    "rsvp": "^3.0.16",
+    "rsvp": "^4.7.0",
     "simple-dom": "^1.0.0",
     "source-map-support": "^0.4.18"
   },