1.3

• add support for hidden exercise series using a token url
• let users download their solutions of a series
• tabs in the feedback table now show the number of failed tests
• add support for config files on a directory level
• files from the media dir can now be used in the feedback table
• course pages should now load faster
• impersonating users is now also possible from the profile page
• fix an issues with exercises without evaluation directory
• minor tweaks and fixes