There was a missing bean definition that was responsible for marking certain milestones based on system events.
Fixes#53
## How to test
1. Log in as an author
2. Go to "Peer" tab within a project
3. Request a peer review
4. [If needed] Switch to another author and request another review
5. Perform a peer review
6. See that the peer reviewer completed milestone (first or second depending) is marked as completed
Reviewed-on: #54
Reviewed-by: Nico Athanassiadis <nico@dsv.su.se>
Co-authored-by: Andreas Svanberg <andreass@dsv.su.se>
Co-committed-by: Andreas Svanberg <andreass@dsv.su.se>