Use ws directly to handle new exec ws route

package.json

@@ -33,7 +33,6 @@
     "ejs-cli": "^2.0.0",
     "express": "^4.15.4",
     "express-session": "^1.15.5",
-    "express-ws": "^3.0.0",
     "gulp-sass": "^3.0.0",
     "hat": "0.0.3",
     "hock": "https://registry.npmjs.org/hock/-/hock-1.3.2.tgz",
@@ -69,7 +68,8 @@
     "underscore": "^1.7.0",
     "uuid": "^3.1.0",
     "valid-url": "^1.0.9",
-    "validator": "^4.9.0"
+    "validator": "^4.9.0",
+    "ws": "https://registry.npmjs.org/ws/-/ws-2.3.1.tgz"
   },
   "devDependencies": {
     "bootstrap-sass": "^3.3.3",