====== What’s new: Open eClass (ver. 2.5) ======
  * New administrator user roles. Course and user administrator role. Users administrator role.        
  * New course user role. Assistant professor role.
  * User can choose to not receive mails from a course.
  * It is possible to require from user, to verify his email address during registration.
  * In "Assignments" teacher can define assignment with time and date deadlines.
  * Fix some bugs in "Exercises" and "Assignments".
  * In "Exercises" teacher can create exercises with existing random questions.
  * In "Video", videos can appear in pop up window inside the browser. 
  * New theme added (ocean).
  * Added German translation.
  * Improved online help.