urlserver.py 1.3: add support of reverse proxy in subdirectory, replace favicon with new weechat logo, set meta referrer to never, fix http_auth in chrome
urlserver.py 1.4: use HTTP 301 instead of meta for the redirection when there is no referer in request
urlserver.py 1.5: replace HTTP 301 by 302
Merge remote-tracking branch 'downstream'

Git update