Remove unused vendor code and add missing dependency

Author: jackycute

package.json

@@ -45,11 +45,11 @@
     "ionicons": "~2.0.1",
     "jquery": "^3.1.1",
     "jquery-mousewheel": "^3.1.13",
-    "jquery-textcomplete": "^1.7.3",
     "jquery-ui": "^1.12.1",
     "js-cookie": "^2.1.3",
     "js-sequence-diagrams": "^1000000.0.6",
     "js-url": "^2.3.0",
+    "js-yaml": "^3.7.0",
     "jsdom-nogyp": "^0.8.3",
     "keymaster": "^1.6.2",
     "list.js": "^1.2.0",