chore(package): remove unused npm deps

Author: jaredallard

package.json

@@ -7,24 +7,19 @@
     "arangojs": "^6.2.3",
     "async": "^2.5.0",
     "body-parser": "^1.18.2",
-    "bufferutil": "^3.0.4",
     "colors": "^1.1.2",
     "cors": "^2.8.4",
     "crypto-promise": "^2.0.0",
     "debug": "^3.1.0",
-    "dockerode": "^2.5.1",
     "express": "^4.16.0",
     "file-stream-rotator": "^0.2.0",
-    "fs-extra": "^5.0.0",
     "mkdirp": "^0.5.1",
     "mocha": "^5.0.5",
     "morgan": "^1.9.0",
     "passport": "^0.4.0",
     "passport-hawk": "^4.0.0",
     "scrypt": "^6.0.3",
-    "semver": "^5.4.1",
-    "utf-8-validate": "^4.0.1",
-    "ws": "^5.1.1"
+    "semver": "^5.4.1"
   },
   "devDependencies": {
     "babel-eslint": "^8.2.2",