Delete users v1.6 changes: Added media gallery content check in options page.
Delete users v1.5 changes: Added option to prevent deleting user if given a resource review.
Delete users v1.4 changes: Now allows for less than 5 conversation messages to be included in selection criteria.
Delete users v1.3 changes: User must now also have zero conversations in order to meet criteria for automatic deletion.
Delete user v1.2 changes: Now using finder for performing database queries.
