add log{Request|Response}{Body|Headers} config params

[stevenbunting]

Adds new parameters to the base (local) config. These parameters are, with defaults,

"logRequestHeaders": True, 
"logRequestBody": True, 
"logResponseHeaders": True,
"logResponseBody": True,

Setting any of them to False will null out the value being sent to Supergood. While this limits SG's ability to do anomaly detection, we think it's a useful feature to allow users to be even more in control of their own data.