Remove unused vendor code and add missing dependency

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",

public/vendor/jquery-textcomplete/jquery.textcomplete.css

@@ -1,33 +0,0 @@
-/* Sample */
-
-.dropdown-menu {
-    border: 1px solid #ddd;
-    background-color: white;
-}
-
-.dropdown-menu li {
-    border-top: 1px solid #ddd;
-    padding: 2px 5px;
-}
-
-.dropdown-menu li:first-child {
-    border-top: none;
-}
-
-.dropdown-menu li:hover,
-.dropdown-menu .active {
-    background-color: rgb(110, 183, 219);
-}
-
-
-/* SHOULD not modify */
-
-.dropdown-menu {
-    list-style: none;
-    padding: 0;
-    margin: 0;
-}
-
-.dropdown-menu a:hover {
-    cursor: pointer;
-}