Project Metrics - Drupal.org's tracking project usage

As of about 2pm PDT Drupal.org has been tracking the module usage. #128827 has been committed to the project module and installed on d.o. There's a follow up issue to make this usage data visible to users (#165380). I've added support to the metrics module to factor that into the score.
I'm not sure if the metrics module will be installed on d.o until the current database troubles resolved.