This works by creating a temp file at config.app_dir and storing the
link in there, followed by directing the local browser to open the file.
HTML meta tags are then used to direct the browser to refresh to a URL
of our choosing (which is HTML escaped, just in case someone tries
something clever)
This should work everywhere, and on any browser (as the file:// format
is defined at https://tools.ietf.org/html/rfc1738 which was posted in
1994).
The URI used (`file://localhost/path`) ensures that we only ever
ask for a localhost file at our path.
The HTML format should be completely compliant with all major browsers
as well, ensuring that behaviour is consistent (assuming they support
HTML meta tags)
First pass utilising 'futurize' to do most of the work.
There's an issue with ur'\"' in l10n.py which I'm not sure how to
properly fix.
This now has errors when hitting the 'Update' button.
