The new version is required for upcoming changes.

The JavaMail API w/o implementation was accidentally used with an
upgrade of the Maven dependency.

This fixes a regression introduced in commit
0b0204e9.

remove sort order code since it's not used and imperformant



See merge request !33

Flashcard revisited

Backend changes for flashcard variant. See arsnova/arsnova-mobile!39

See merge request !32

Jetty 9.3 increases the JRE requirement to version 8.

Tests failed because they did not allow a charset parameter in
Content-Type headers.

Admin interface

This merge request implements api functionality for the admin interface (https://git.thm.de/arsnova/arsnova-admininterface).

See merge request !23

add property to enable export to click



See merge request !31

Free text validation is no longer done for abstentions.

This fixes a regression introduced in
9fc360d6.