Fixup: Add comment explaining dependency on Google Maps API for Viewf…

…inderView

src/js/models/AppModel.js

@@ -68,6 +68,9 @@ define(['jquery', 'underscore', 'backbone'],
       * Your Google Maps API key, which is used to display interactive maps on the search
       * views and static maps on dataset landing pages.
       * If a Google Maps API key is not specified, the maps will be omitted from the interface.
+      * The Google Maps API key also controls the showViewfinder feature on a Map
+      * and should have the Geocoding API and Places API enabled in order to
+      * function properly.
       * Sign up for Google Maps services at https://console.developers.google.com/
       * @type {string}
       * @example "AIzaSyCYyHnbIokUEpMx5M61ButwgNGX8fIHUs"

src/js/models/maps/Map.js

@@ -54,7 +54,9 @@ define([
        * @property {Boolean} [showHomeButton=true] - Whether or not to show the
        * home button in the toolbar.
        * @property {Boolean} [showViewfinder=false] - Whether or not to show the
-       * viefinder UI and viewfinder button in the toolbar.
+       * viefinder UI and viewfinder button in the toolbar. The ViewfinderView
+       * requires a Google Maps API key present in the AppModel. In order to 
+       * work properly the Geocoding API and Places API must be enabled. 
        * @property {Boolean} [toolbarOpen=false] - Whether or not the toolbar is
        * open when the map is initialized. Set to false by default, so that the
        * toolbar is hidden by default.

src/js/views/maps/viewfinder/ViewfinderView.js

@@ -17,6 +17,8 @@ define(
      * @classdesc ViewfinderView allows a user to search for
      * a latitude and longitude in the map view, and find suggestions
      * for places related to their search terms.
+     * This view requires a Google Maps API key in order to function properly,
+     * and must have the Geocoding API and Places API enabled.
      * @classcategory Views/Maps
      * @name ViewfinderView
      * @extends Backbone.View