Add ability to specify certain tables to exclude when backing up the database

[gjastrab]

If an application that doesn't need certain logging tables when replicating an environment to other environments it would be nice to easily exclude these when running local:backup_db.

Ensuring the table still exists when it is restored is an issue, perhaps remote|local:restore_db could take an argument on whether to preserve certain tables, or to ensure an empty table definition is restored.