groups.js added
invitations added in groups
groups changed
groups changed
Merge remote branch 'origin/master' into laura
groups changed
Improved access to user_set in various classes
Updated the webdav library
Merge remote branch 'origin/master' into laura
When updating principal properties, a file (/system/js/principals.js) is created holding all displaynames of all principals
Pieters changes: mainly improving the groups view
Merge remote branch 'origin/master' into laura

Conflicts:
	src/beehub_principal_collection.php
	src/beehub_sponsor.php
UNSTABLE Pieter enabled the login button.
Merge branch 'laura' of github.com:sara-nl/BeeHub into laura