New model method - @widget.unique_impression_count_ip - This gives you unique impression account filtered by IP (and in turn request_hash since they have same IPs)
@widget.unique_impression_count now uses request_hash. This was incorrectly stated in the README, since it was using ip_address. The README is correct as a result of the method change.
Fix issue #1 - action_name and controller_name were not being logged for impressionist method inside action