fixed #160
Fixed #212

locks with depth infinite are now allowed on non-collection resources for better compatibility with MS Office
Fixed issue #211: a bug which prevented filtering when joining a group
Merge remote branch 'origin/1.3'
Fixed server response when creating user or group with wrong name.

Finished issue #160
Merge branch 'tests'

Conflicts:
	src/BeeHub_Groups.php
	src/BeeHub_Lock_Provider.php
	src/BeeHub_Users.php