Universe: update time automagically.

Adds a dummy dependency to the collection so it updates whenever something changes in it.

Closes #41
(cherry picked from commit 5efb577ab2638826d84cfffef9ca7cc3c6bba9d0)
Merge pull request #78 from inaes-tic/crear/merge/universe-time-rebased

Crear/merge/universe time rebased