#3 Small bug fixes
security calendar and group methods
admin event bugfix
#8 Added basic functionality for recurring events. Allows user to set intervals, etc.
Also display these new types of events on the calendar.
# User permissions
Merge branch 'frontend_implementation' into Development

Conflicts:
	app/views/group/editGroups.blade.php
#3 + #8 Permission management per group + updated iCal export
Bugfix register user/school
Datetimepicker bugfix
Bugfixes in various files
Remove sorting where not needed (DataTables.js)
Placeholder About and Settings pages
Merge branch 'Development' into frontend_implementation

Conflicts:
	app/views/landing.blade.php
	app/views/layout/master.blade.php