Create fs-overlay, post-build

Setup buildroot filesystem overlay and move our custom scripts/configs
into it.  Setup a post-build script and have it delete files generated
by buildroot that aren't in RescueOS v1.1.

This gets us closer to a buildroot configuration that will automatically
generate RescueOS images.  For now, we're using RescueOS v1.1 as a
reference.

fs-overlay/rescueOS/shutdown-cleanup

@@ -0,0 +1,35 @@
+umount_maemo()
+{
+sync
+umount /mnt/maemo
+ubidetach /dev/ubi_ctrl -d 0
+}
+cd /
+
+
+echo "Sending all processes the TERM signal..."
+kill -15 -1
+umount_maemo
+
+sleep 1
+echo "Sending all processes the KILL signal..."
+kill -9 -1
+
+umount_maemo
+
+
+
+echo "Unmounting  filesystems..."
+umount -a -r 2> /dev/null  
+
+
+sync
+
+#reset timer.
+sleep 3 
+[ -f /run/charger-runned ] && i2cset -y -m 0x80 2 0x6b 0x04 0x80
+sleep 1
+echo 
+echo "RescueOS says good bye - have a good day."
+sleep 3
+poweroff -f