Made session attribute in AudioStream public

Ignore-this: 6246c5874c9df9198e82f988f4568234

darcs-hash:20121012114153-56b4d-80fa097c99e06c8862b18a262c365d7d65efaaca
Remade ChatStream identity properties public

Ignore-this: 1691332d4175fc146966e2c0d778dc1

darcs-hash:20121016131220-b22ec-49664335a87fe815348b6309d2a23dc18ccda62d