Remove first element of array before looping through it

Conflicts:
	lib/Sabre/DAV/Server.php
Change integer depth parameter to boolean getChildren for getNodesForPath method

Conflicts:
	lib/Sabre/CalDAV/ICSExportPlugin.php
	lib/Sabre/CardDAV/VCFExportPlugin.php
	lib/Sabre/DAV/Server.php