Protocol communication recording

[chfoo]

There should be a layer in the library that records protocol communication in a well defined manner.

For example, it should dump out a JSON document per line for every packet send or received:

{
  "date": "2014-01-01T12:34:12Z",
  "destination": "123.45.67.89",
  "data": "[base 64 content here]",
  "readable": "<Packet Rx=34 Tx=35 Token=AA StreamID=123 ><Atom Blah=1 Blah=2 Args=123>...",
}