BUGFIX: Allow files that don't have an extension (most notably folders)
BUGFIX: Ensure that file URL rewriting works if you rename a page twice without publishing.
BUGFIX: Ensure that the page doesn't go green after URLs are rewritten
ENHANCEMENT: Recognise HTTP_X_FORWARDED_HOST header and use that in place of HTTP_HOST (from r93148) (from r96752)
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@102381 467b73ca-7a2a-4603-9d3b-597d59a354a9