Remove debug setting
Less output
Switching to the dev-master version of sabre/vobject

This should output some debug information
Ensuring that If: with an etag does not error on a collection.

Issue #428
Merge branch '1.7' into 1.8
Fixing #428 on the 1.8 branch.
Merge branch '1.8'

Conflicts:
	ChangeLog
	lib/Sabre/DAV/Locks/Plugin.php
	tests/composer.vobject3.json
Fix for #428 on master.