implemented revert rate metric. returns [user_id, reverts / revision, total revisions].
implemented revert rate metric. returns [user_id, reverts / revision, total revisions].

The process() method handles data generation for a given set of users over a given time-frame.

wikimedia/user_metrics,wikimedia/user_metrics,rfaulkner/wikipedia_user_metrics,rfaulkner/wikipedia_user_metrics,wikimedia/user_metrics,wikimedia/analytics-user-metrics,wikimedia/analytics-user-metrics,rfaulkner/wikipedia_user_metrics,wikimedia/analytics-user-metrics