overwrite Sabre_DAV_ObjectTree with a faster getNodeForPath
make use of the fact that rmdir is already recursive
improved move operation for sabre's objecttree
use new ObjectTree in sabredav
improved copy operation for objecttree
style fix
Merge branch 'master' into sabre-objecttree
Merge pull request #3898 from owncloud/sabre-objecttree

WebDAV performance improvements