use CouchRest::Database#changes, store and retrieve seq

This commit bundles a few different changes:
* we now use the CouchRest::Database#changes stream instead of our own
* we store and read the last sequence number so on a restart we can start where we left
* we now have a UserDatabase class rather than the CouchDatabaseCreator. It also knows about it's name and we create an instance of it per database we want to create. It's also more flexible when the databases already exist.

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