Merge branch '66-add-support-for-multiple-excuse-types' into 'master'

aleksis/apps/alsijil/forms.py

aleksis/apps/alsijil/menus.py

aleksis/apps/alsijil/migrations/0002_excuse_type.py

aleksis/apps/alsijil/model_extensions.py

aleksis/apps/alsijil/models.py

aleksis/apps/alsijil/static/css/alsijil/full_register.css

aleksis/apps/alsijil/tables.py

...apps/alsijil/templates/alsijil/class_register/lesson.html

...is/apps/alsijil/templates/alsijil/excuse_type/create.html

aleksis/apps/alsijil/templates/alsijil/excuse_type/edit.html

aleksis/apps/alsijil/templates/alsijil/excuse_type/list.html

...s/apps/alsijil/templates/alsijil/excuse_type/warning.html

...sis/apps/alsijil/templates/alsijil/partials/absences.html

...s/apps/alsijil/templates/alsijil/print/full_register.html

aleksis/apps/alsijil/urls.py

aleksis/apps/alsijil/views.py