Include privatebin within images

src/freedombone-image-customise

     git clone $KANBOARD_REPO $rootdir/repos/kanboard
     git clone $KEYSERVER_WEB_REPO $rootdir/repos/keyserverweb
     git clone $PEERTUBE_REPO $rootdir/repos/peertube
+    git clone $PRIVATEBIN_REPO $rootdir/repos/privatebin
     #git clone $WEKAN_REPO $rootdir/repos/wekan
     #git clone $FLOW_ROUTER_REPO $rootdir/repos/flowrouter
     #git clone $METEOR_USERACCOUNTS_REPO $rootdir/repos/meteoruseraccounts