minder stricte checking op het format van studentnummers
oops
added an informative error for non-matching grade types
Merge pull request #3 from joostrijneveld/master

added an informative error for non-matching grade types; assumes that "Score" is the default
Add f-prefix to user list fetcher
Merge pull request #4 from StevenReitsma/master

Add f-prefix to user list fetcher