Let puppet do the initial fill of the database

Puppet will now:
- import known types, sub-types and disciplines. That way we keep our IDs stable
- clear our caches and set the request slots up
- run tools/update-items-from-api.php to get the initial batch of items. Due to the amount of items, the provisioning will take quite some time and php will be swapping a lot in the end...
Updated the Readme to describe where to continue after a "vagrant up"