1.8.8 -> 1.8.9.
Merge branch 'master' of github.com:fruux/sabre-dav
Merge branch 'master' of github.com:fruux/sabre-dav

Conflicts:
	ChangeLog.md
Correctly disabling the external entity loader.
Restoring xml entity loader setting.
Merge branch '1.7' into 1.8

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

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