Vue Comments: Comments ported to Vue + DnD fileupload

* Drag and drop files to comment editor to add a file attachment
* Using Vue to render comments

Since comments now has attachments we need to update the schemas
./manage.py maintenance replace_pillar_node_type_schemas

package.json

@@ -38,7 +38,8 @@
     "glob": "7.1.3",
     "jquery": "3.3.1",
     "popper.js": "1.14.4",
-    "video.js": "7.2.2"
+    "video.js": "7.2.2",
+    "vue": "2.5.17"
   },
   "scripts": {
     "test": "jest"