added logic to make selecting log files more flexible.  Args can now be passed in place of manually modifying the script.
added logic to make selecting log files more flexible.  Args can now be passed in place of manually modifying the script.

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