updated docs (#165)

  - includes example of requiring a different script.

docs/en/code/index.md

@@ -0,0 +1,50 @@
+#Extending
+
+To change how the front-end javascript displays the map the custom script with the unique id `locator_map_init_script`.
+This example shows how to reference custom templates and a custom data location. It is recommended to copy the custom script from the [Locator Controller](../../../code/pages/Locator.php#L273-L298) and modify it.
+
+```php
+class Locator_ControllerExtension extends Extension
+{
+
+    public function onAfterInit()
+    {
+        $load = 'autoGeocode: false,  
+            fullMapStart: true,';
+        $kilometer = ($this->owner->data()->Unit == 'km') ? "lengthUnit: 'km'" : "lengthUnit: 'm'";
+        $modal = ($this->owner->data()->ModalWindow) ? 'modalWindow: true' : 'modalWindow: false';
+
+        Requirements::customScript("
+            $(function(){
+                $('#map-container').storeLocator({
+                    {$load}
+                    dataLocation: '{$this->owner->Link()}SimpleXML.xml',
+                    listTemplatePath: '{$this->owner->listTemplate}',
+                    infowindowTemplatePath: '{$this->owner->windowTemplate}',
+                    originMarker: true,
+                    visibleMarkersList: false,
+                    storeLimit: -1,
+                    maxDistance: true,
+                    slideMap: false,
+                    distanceAlert: -1,
+                    {$kilometer},
+                    {$modal},
+                    mapID: 'map',
+                    locationList: 'loc-list',
+                    mapSettings: {
+                        zoom: 0,
+                        mapTypeId: google.maps.MapTypeId.ROADMAP,
+                        disableDoubleClickZoom: false,
+                        scrollwheel: true,
+                        navigationControl: false,
+                        draggable: true
+                    }
+                })
+            });",
+            "locator_map_init_script");
+    }
+}
+```
+
+Please note that this will replace the script that is loaded.
+More options for the javascript map options can be found [here](https://github.com/bjorn2404/jQuery-Store-Locator-Plugin).

docs/en/index.md

@@ -4,4 +4,6 @@
 
 See [User Guide](userguide/index.md) for information on using the Locator module in the CMS.
 
-See [Importing Locations](userguide/import.md) for information on importing Location and Category records.
+See [Importing Locations](userguide/import.md) for information on importing Location and Category records.
+
+See [Extending](code/index.md) for information on how to extend some functionality.