msobczyk/handle signals in docker entrypoint

handle signals in docker entrypoint, handle exit in start_clive script (close container on terminal close), closes issue #274 (closed)

docker/entrypoint.sh

 #!/bin/bash
 
 set -euo pipefail
+set -m
 
 SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 
 cleanup () {
   echo "Performing cleanup...."
+  jobs -l
   while pkill -INT -P $$
   do
     sleep 1