Fixed a bug with the directory tree in the client
Minor improvement of the directory tree implementation
Merge branch 'laura_client2' of github.com:sara-nl/BeeHub into laura_client2
Fixed a bug which didn't show the 'allow read, write' privilege right in the popup version of the ACL view
Now closes the directory tree view when changing to the ACL tab
Fixed issue #193; browser will now determine content-type when uploading files