Integrate David's initial HTTP server
Integrate David's initial HTTP server

The doorbell state is destroyed when the serve_wifi_client() call
returns.  Also, because I'm developing on a Sparkfun ESP8266 Thing
Dev board, I don't have his original pins broken out, so I've
commented out the digital_write calls.

SpinInven/iDONT,SpinInven/iDONT