Update spectacle dep to depend on necessary branch

package.json

@@ -22,7 +22,7 @@
     "bluebird": "^3.4.7",
     "cors": "^2.8.1",
     "express": "^4.14.0",
-    "spectacle-docs": "^0.6.9",
+    "spectacle-docs": "madlittlemods/spectacle#feature/promise-return",
     "swagger-express-middleware": "^1.0.0-alpha.12",
     "swagmock": "^1.0.0"
   },