Directory importer

This PR adds a revised auto importer that uses a limited nested directory structure to create  containers and initiate imports. An example directory is included though this should probably be changed to use fakes and add fake screens. A readme file describes the directory structure.

The intention here is to firstly allow different import scenarios by rsyncing data into place and then running the script, avoiding duplication of configuration files. Ultimately with proposed modifications to DropBox a simple rsync to the DropBox folder should have the same effect as running the script.