Happy New Year!
Merge branch '1.7' into 1.8

Conflicts:
	lib/Sabre/CalDAV/includes.php
	lib/Sabre/CardDAV/includes.php
	lib/Sabre/DAV/includes.php
	lib/Sabre/DAVACL/includes.php
	lib/Sabre/HTTP/includes.php
Merge branch '1.8'

Conflicts:
	lib/Sabre/CalDAV/Backend/BackendInterface.php