added network monitoring debug capability

see https://github.com/detro/ghostdriver/issues/221
separated resource req/recv removed comma
Merge branch 'master' of https://github.com/wgroeneveld/ghostdriver into wgroeneveld-master
Removing the "networkLogging" Caps: if in DEBUG, it's always there.

I'll add a Capability to enable/disable "pretty printing" of JSON object that are part of the logging.
Merge branch 'master' of https://github.com/detro/ghostdriver