Analytics initial

[ ] All feature requirements and acceptance criteria are met. (noted below) [ x ] Automated tests and style checks are passing (if applicable) [ x ] You have hand-reviewed it yourself [ x ] All extraneous print statements, comments, and cruft have been removed [ x ] You would say you're proud of your work

Duration and memory of submissions not recorded. Showing submission sizes is fairly easily doable, but will require many database hits (1 for every submission that exists within the requested date range).