Update gitignore to ignore node_modules
Add basic Denon module
Add basic Lutron RadioRA2 module
Add Cambridge example

This also updates sonos-experimental and route to support state event
transmission to web.

While it may differ from other implementations, it shouldn't break them.
Maybe?

If it does break them, first look at sonos-experimental, which was
updated to support Node 0.10 and IP-address detection on Windows.