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Release version 2.2.0

Major features:
* Peer Instruction: A question can now be answered again in a second round.
  To limit the answering time, a countdown timer can be activated.
* Full screen mode: The browser automatically enters full screen mode when
  presenting questions. Additionally, a theme optimized for projections is used
  in this case. The font size can be adjusted.
* Learning analytics: Multiple calculation options for learning progress have
  been introduced.
* Image answers (experimental): Free text answers can now be answered with an
  image (the feature has to be enabled explicitly for a question).
* Performance: A lot of improvements have been introduced to make the UI more
  responsive

Minor features and changes:
* Simplified text formatting: A formatting tool bar has been introduced.
* Video embedding from YouTube and Vimeo
* Code syntax highlighting in questions
* Hint & solution for questions
* Session info: The previously with public pools introduced session info is now
  available for all sessions.
* QR Code: It is now possible to generate and display QR Codes for a sessions
  directly from ARSnova Mobile.
* Role switching: Switching between speaker to student views is now possible
  without leaving a session or logging out.
* Embedded pages: External websites are now embedded in ARSnova (if possible)
  instead of opening a new browser tab.
* Usability improvements and bug fixes

Bugfixes:
* Fixed a rendering bug with latest Chrome versions (43+) which made question
  answering impossible.

This version is brought to you by:
Project management: Klaus Quibeldey-Cirkel
Lead programming: Andreas Gärtner, Daniel Gerhardt, Christoph Thelen
Contributions: Simon Hauck, Marcel Hedderich, Dominik Hikade, Nicola Justus,
Tom Käsler, Maximilian Klingelhöfer, Franciska Periša, Simeon "EinBaum" Perlov,
Björn Pfarrreis, Sviatlana Plakhina, Dennis Schönhof, Katharina Staden,
Max Steinwachs