Replace dateCreated/lastUpdated w/ autotimestamp
Implement access checks
Script for travis to build core-api from branch

For use whenever core-db changes depends on changes in core-api. The two
branches should have the same name.
travis: make grails unzip quiet
Travis already has Maven

Plus, travis was not even using the downloaded version.
Merge pull request #25 from thehyve/access_api

Implement access checks