Change default for missing data to demo better.
Merge pull request #381 from cpoulain/master

Change default for missing data to demo better.
Fix #387 - Creating competition is not transactional
Merge pull request #388 from javierluraschi/Fix387

Fix #387 - Creating competition is not transactional
Merge substantive changes from PR #386.
Merge pull request #389 from cpoulain/master

Merge substantive changes from PR #386.
Merge branch 'master' into dev