Fixed the release code of Byzantium on the "Will it blend?" HTML files to
match that which is actually in release (v0.5b).

Signed-off-by: The Doctor <drwho@virtadpt.net>
Exempt all traffic from non-client networks from the captive portal

Fixes #229
Try to prevent any caching of fake DNS replies
Try to prevent caching of captive-portal pages
Merge branch 'master' of https://github.com/Byzantium/Byzantium