Fixed typo in getUniversalRankings()

Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com>
Merge branch 'northdpole/teachingModules' of github.com:Hackademic/hackademic into northdpole/teachingModules
plugin hook functions (i seriously have to find some time to finish this before the universe ends

Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com>