* Demo now uses the database specified.
* Only Creates H2 if user does not specify driverClassName
* Will use prefix that is specified by the spring.batch.jdbc.table-prefix property
* Updated test to remove duplicate launch.
- Remove unused timestamp task apps `docker/assembly.xml`
- Resurrect the timestamp task/batch 2.0.x app
- Add the resurrected apps to CI which publishes them to `/milestone`