Added fixes for latest Stitch changes

Configuring-the-Raspberry-Pi.md

@@ -19,12 +19,23 @@ Then reboot the pi:
 sudo reboot
 ````
 
-## Autohiding the Mouse Cursor
+## Autohiding the Mouse Pointer
 Install _unclutter_: 
 ````
 sudo apt-get install unclutter
 ````
-Create the .xinitrc script to run the tool.  See https://wiki.archlinux.org/index.php/Unclutter
+You can create an `.xinitrc` script to run the tool.  
+See https://wiki.archlinux.org/index.php/Unclutter
+
+But a simpler option is to add a line to the end of the file:
+
+```bash
+$ sudo nano /etc/xdg/lxsession/LXDE-pi/autostart
+...
+@unclutter -display :0 -idle 3 -root -noevents
+```
+This will add a 3 second delay, before the pointer disappears from the screen when not using it.
+
 
 ***
 __version 1 only__
@@ -64,7 +75,7 @@ Add the following lines
 options 8192cu rtw_power_mgnt=0 rtw_enusbss=1 rtw_ips_mode=1
 ```
 
-**For Raspberry Pi 3**  
+**For Raspberry Pi 3 (`Jesse` and below)**  
 Edit _/etc/network/interfaces_
 ```shell
 sudo nano /etc/network/interfaces
@@ -80,6 +91,33 @@ Reboot your PI
 sudo reboot
 ```
 
+**For RPi 3 (Raspbian Stitch)**
+
+We no longer have any default entries in */etc/network/interfaces*, 
+instead we make a plugin to the (service) startup script. 
+Copy paste the following into you terminal:
+
+```bash
+cat << EOF | sudo tee /etc/network/if-up.d/off-power-manager
+#!/bin/sh
+# off-power-manager - Disable the internal power manager of the (built-in) wlan0 device
+# Added by MagicMirrorSetup
+iw dev wlan0 set power_save off
+EOF
+```
+
+Then set the permissions and reload the network daemon. 
+
+```bash
+sudo chmod 755 /etc/network/if-up.d/off-power-manager
+sudo /etc/init.d/networking restart
+```
+You don't need to reboot for this to take effect, but do it anyway to make sure it works.
+After reboot and your wifi is back up, test with: 
+```bash
+iw dev wlan0 get power_save
+``` 
+
 ## Enable file sharing with OS X
 
 Install _Netatalk_: