Adds Tag Model that will be apply to different models.

models/comment.js

@@ -30,27 +30,6 @@ const StatusSchema = new Schema({
   _id: false
 });
 
-/**
- * The Mongo schema for a Comment Tag.
- * @type {Schema}
- */
-const TagSchema = new Schema({
-  name: String,
-
-  // The User ID of the user that assigned the status.
-  assigned_by: {
-    type: String,
-    default: null
-  },
-
-  created_at: {
-    type: Date,
-    default: Date
-  }
-}, {
-  _id: false
-});
-
 /**
  * The Mongo schema for a Comment.
  * @type {Schema}
@@ -74,7 +53,6 @@ const CommentSchema = new Schema({
     enum: STATUSES,
     default: 'NONE'
   },
-  tags: [TagSchema],
   parent_id: String,
 
   // Additional metadata stored on the field.