Delete users 1.5

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.