Fix the README to reflect the new and improved data structure
Fix the README to reflect the new and improved data structure

The diagram is now consistent with the code.

sunil07t/e-mission-server,yw374cornell/e-mission-server,e-mission/e-mission-server,joshzarrabi/e-mission-server,shankari/e-mission-server,joshzarrabi/e-mission-server,sunil07t/e-mission-server,shankari/e-mission-server,yw374cornell/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,e-mission/e-mission-server,joshzarrabi/e-mission-server,joshzarrabi/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,shankari/e-mission-server,yw374cornell/e-mission-server,yw374cornell/e-mission-server,shankari/e-mission-server