CONTRIB-4978 re-add missing language string
Adding 2.7 style events for logging
Now requiring Moodle 2.7
Prevent appointment slots in the past only if they are empty
CONTRIB-5018 Fix creation of slots when Force Overlap is selected
General cleanup
Removing deprecated function calls, general cleanup
Refactoring the teacher view
Fixing a bug in calendar event updates
Fix upgrade to work with Postgresql, too
Merge pull request #15 from brki/fix-27-postgresql-upgrade

Merged into master branch - thanks for providing the fix
Removing "reuse guard time"
Implementing new guard time instead
Action menus instead of buttons in teacher view
improvements for non-js users
Remove old reference to unused field
possible problems with null teachers
Guardtime in student view
API cleanup
Release notes for 2.7
Moving date rendering functions to renderer
refactoring scheduler deletion