Fix for #407.
Merge branch '1.7' into 1.8

Conflicts:
	ChangeLog
	lib/Sabre/DAV/Version.php
	lib/Sabre/HTTP/Version.php
Bumped versions
Merge branch '1.8'

Conflicts:
	ChangeLog
	lib/Sabre/DAV/Version.php
	lib/Sabre/HTTP/Response.php
	lib/Sabre/HTTP/Version.php