Statistics
==========
Following statistics are gathered and submitted to Google Analytics

Category      | Action         | Label          | Value     
--------------|----------------|----------------|-------------------
challenges    | list           |                |
challenges    | challenge_[#]  | open           |
challenges    | challenge_[#]  | win            |
sandbox       | open           |                |
sandbox       | edit           |                |
sandbox       | create         |                |
sandbox       | remove         |                |