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Peer connection
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* Make it possible to specify one STUN server and / or one TURN server.
* Add `BUNDLE` support to use a single ICE/DTLS transport for multiple media.
* Move media encoding / decoding off the main thread.
Data channels
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* Use SCTP `ABORT` instead of `SHUTDOWN` when stopping :class:`RTCSctpTransport`.
* Advertise support for SCTP `RE-CONFIG` extension.
* Make :class:`RTCDataChannel` emit `open` and `close` events.
Examples
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* Add an example of how to connect to appr.tc.
* Capture audio frames to a WAV file in server example.
* Show datachannel open / close events in server example.