Added hidden and local picture examples

- Moved hidden value to a new entry since example of setting a picture and hiding it seems counter intuitive.
 - Added example of using local picture as icon.

source/getting-started/devices.markdown

@@ -76,6 +76,7 @@ For more details please check the [Group](https://home-assistant.io/components/g
 
 By default, all of your devices will be visible and have a default icon determined by their domain. You can customize the look and feel of your front page by altering some of these parameters. This can be done by adding the following configuration inside the `homeassistant:` section.
 
+Devices that you dont want to have visible can be hidden with `hidden`.  
 `entity_picture`entries, badges, `device_tracker` pictures, etc. can either be external URLs (e.g. `http://example.com/example.jpg`) or of the form `/local/filename.jpg`, where `/local` represents the directory `www` in the HASS configuration directory. You may have to create the `www` directory yourself as it is not made automatically.
 
 You can also use `icon` and refer to any icon from [MaterialDesignIcons.com](http://MaterialDesignIcons.com).
@@ -87,11 +88,15 @@ homeassistant:
   # Add this to your existing configuration
   # Only the `entity_id` is required.  All other options are optional.
   customize:
-    thermostat.family_roomfamily_room:
+    sensor.living_room_motion:
      hidden: true
+    thermostat.family_roomfamily_room:
       entity_picture: https://dl.dropboxusercontent.com/u/12345/images/nest.jpg
       friendly_name: Nest
     switch.wemo_switch_1:
+      friendly_name: Toaster
+      entity_picture: /local/toaster.jpg
+    switch.wemo_switch_2:
       friendly_name: Kitchen kettle
       icon: mdi:kettle
 ```