Adding kernelpurge example hook to remove all kernel images except the newest one.

examples/hooks/kernelpurge.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# This is a hook for live-helper(7) to remove any kernel except the newest one.
+# To enable it, copy or symlink this hook into your config/chroot_local-hooks
+# directory.
+
+for VERSION in $(basename $(ls /boot/vmlinuz-* | head -n-1) | sed -e 's|^vmlinuz-||g')
+do
+	echo apt-get remove --purge linux-image-${VERSION}
+done