libtorc-core: Add Torc::NetworkChanged event
libtorc-core: Improved updates to origin whitelist in TorcHTTPServer
libtorc-core: Add TorcNetwork::IsExternal and TorcNetwork::IsGlobal

- static helper methods.
libtorc-core: Don't perform reverse DNS lookup for link-local addresses
libtorc-core: Allow duplicate host names in TorcNetwork

- with multiple interfaces, Bonjour will return the same result multiple
times and signal their 'removal' when one interface goes down.
- filter the actual list before passing on to clients.
libtorc-core: Notify when the network configuration has changed.
libtorc-core: Fix typo
html: Use the DOM to determine the host address from javascript.

- works around all sorts of issues with link local ipv6 addresses -
could have saved a lot of time if I'd thought of this earlier :)
libtorc-core: Remove ServerAuthority from torcconfiguration.js
html: Minor tweak to index.html