Release version 2.6.0

Improvements:
* Guest authentication is now retained when logging in and will be
  restored after logging out.
* Questions and slides are now automatically released for answers/
  comments after creation.
* Forms for question creation/editing no longer show settings irrelevant
  for the question type.
* The solution can now be shown for free text questions.
* The statistics button now appears immediately after answering free
  text questions.

Changes:
* Switched from serif font to sans-serif font.

Bug fixes:
* The correct answer is no longer revealed by order for yes/no questions
  imported from CSV.
* Pressing <ENTER> in the question's submit field when editing no longer
  reloads the web app.

Removed features:
* Import and export for arsnova.cards and arsnova.click formats has been
  removed.

Known issues:
* CSV import/export does not work for flashcards.

Release version 2.6.1

Improvements:
* The web font is now included so modern browsers should no longer fall
  back to alternatives.

Changes for developers:
* Web fonts can now be downloaded with the new Grunt `font` task. It is
  automatically executed as part of `build` and `run` tasks.

Release version 2.7.0

Features:
* Users can now delete their own account through the settings panel.
* Admins can now delete any account or session through the settings panel.

Improvements:
* CSV Export: A settings panel has been added. Semicolon and tab can be used
  as separator. An Excel-specific header can be added to improve compatibilty.
* The ability to set custom icons for authentication services via backend
  configuration has been restored.
* Export/import functionality is no longer disabled for iOS.

Bug fixes:
* The flip animation for flashcards has been disabled to fix rendering issues in
  some browsers.
* CSV export now works for flashcards.
* Cloning of sessions from the public pool has been fixed.

Known issues:
* CSV import is not supported for flashcards.

Release version 2.7.1

Bug fixes:
* Rendering of `<hlcode>` elements (broken in 2.7.0) works again.
* Abstentions for grid questions have been fixed.
* A JavaScript `TypeError` caused by fullscreen mode in some modern
  browsers has been fixed.