[dir view] added 'file comment'

static/scripts/app/collections/file-comments.js

@@ -0,0 +1,24 @@
+define([
+    'underscore',
+    'backbone',
+    'common'
+], function(_, Backbone, Common) {
+    'use strict';
+
+    var collection = Backbone.Collection.extend({
+
+        url: function() {
+            return Common.getUrl({name: 'file-comments', repo_id: this.repo_id});
+        },
+
+        parse: function(data) {
+            return data.comments; // return the array
+        },
+
+        setData: function(repo_id) {
+            this.repo_id = repo_id;
+        }
+    });
+
+    return collection;
+});