Merge pull request #3 from UQ-CMM-Mirage/master

Make sure that we run with the standard mytardis logging
Merge pull request #5 from crawley/master

Changes to track the Datafile Migration #2 pull request for mytardis
Ripple from Grischa's ACL overhaul
Merge pull request #10 from crawley/dev

Regression from Grischa's ACL improvements
Set the timestamps when creating Dataset_File objects (+ file headers)