* Calendar : created basis for calendar view
* Calendar : tasks appear in calendar by due date
* Tasks : now possible to set due date, tasks on calendar
* Calendar : better way of showing day tasks
* Calendar : now possible to switch month
* Calendar : now possible to edit tasks on calendar
* Calendar : colors show if late + today circled
* Tasks : corrected focus problem in task edition
* Calendar : now with drag&drop feature and possible to add tasks
* Calendar : bugfix : task date changes through d&d were discarded when
* changing month
* Calendar : bugfixes on tasks and colors (previous months tasks weren't late)
* Calendar : small bugfix
* Calendar : added new logo
Merge branch 'Features/calendar' into develop