Engagement analytics

This is the indicator component of the Engagement analytics suite. Make sure to also get the report and block!
Moodle Engagement Analytics for Moodle 2
* IMPORTANT *
This plugin is useless on its own, you should also get the report and block plugins that are part of the set.
http://moodle.org/plugins/view.php?plugin=report_engagement
http://moodle.org/plugins/view.php?plugin=block_engagement
* CREDITS *
Code: Adam Olley <adam.olley@netspot.com.au>
Code: Ashley Holman <ashley.holman@netspot.com.au>
Concept: Phillip Dawson <phillip.dawson@monash.edu>
Indicator Algorithms: Phillip Dawson <phillip.dawson@monash.edu>