Add conference data to the Database Project.

Again, this is added to the post-deployment script.
Fix agenda date.

This was a couple of days out.
Fix registration date.

This was also a couple of days out.
Fix conference close time.

The conference ends at 17.00, not 18.30.
Merge pull request #157 from alastairs/fix-database-project

Add conference data to the Database Project.