Added graphql docs endpoint.

package.json

@@ -64,6 +64,7 @@
     "express": "^4.14.0",
     "express-session": "^1.14.2",
     "graphql": "^0.8.2",
+    "graphql-errors": "^2.1.0",
     "graphql-server-express": "^0.5.0",
     "graphql-tag": "^1.2.3",
     "graphql-tools": "^0.9.0",
@@ -120,6 +121,7 @@
     "eslint-plugin-standard": "^2.0.1",
     "exports-loader": "^0.6.3",
     "fetch-mock": "^5.5.0",
+    "graphql-docs": "^0.2.0",
     "hammerjs": "^2.0.8",
     "ignore-styles": "^5.0.1",
     "immutable": "^3.8.1",