Show only active records in visitor counter

[electerious]

The current implementation shows all records that have been updated in the last 30 seconds. A user that navigates between pages will therefore increase the counter temporary.

We should improve the aggregation to only show non-anonymized data (the most recent visit of a user): https://github.com/electerious/Ackee/blob/master/src/aggregations/aggregateActiveVisitors.js

The check can be the same as for unique views: https://github.com/electerious/Ackee/blob/master/src/aggregations/aggregateViews.js#L21

Original report: electerious/ackee-tracker#24

[electerious]

Fixed. Will be part of the next release.