Make the plugin runnable again plus other improvements

- Autogenerate start scripts via the application plugin
- Removed upload functionality for the jar.
- Enabled wrapper build.
- Use timestamp as version number
- Use 2.1 version of the Maven helper plugin instead of 2.2-SNAPSHOT. That might introduce some issues. But the provisioning of the 2.2-SNAPSHOT-jar was fragile. Let's see how this turns out.
- Updated readme