Making travis quieter.
Several optimizations to reduce peak memory usage when a directory has a large number of files
Update docs for method parameters and add type hint
Add back in methods getPropertiesForPath, getPropertiesForMultiplePaths
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