Fixing some identifiers for easy co-maintenance with other EOxServer vagrant instances.
Allowing to create any collection type of any module.
Merge branch 'create-any-collection-type' into vires-db-models
Fixing import of module.
Adding documentation.
Merge branch 'create-any-collection-type' into vires-db-models
Adding command for registering a new ProductCollection. Redoing Product and ProductCollection admins.