Peerjs

- Workaround for hitting Chrome 31+ buffer limit.
- Add `.bufferSize` to DataConnection to indicate the size of the buffer queue.
- Add `.dataChannel` to DataConnection as an alias for `._dc`, which contains
the RTCDataChannel object associated with the DataConnection.
- Update BinaryPack dependency.

- Fix bug where chunks were being emitted.

- Fix file transfer issue in Chrome by chunking for data over 120KB.
- Use binary data when possible.
- Update BinaryPack dependency to fix inefficiencies.

- Fix exceptions when peer emits errors upon creation
- Remove extra commas

- Use SCTP in Chrome 31+.
- Work around Chrome 31+ tab crash. The crashes were due to Chrome's lack of support for the `maxRetransmits` parameter for modifying SDP.
- Fix exceptions in Chrome 29 and below.
- DataChannels are unreliable by default in Chrome 30 and below. In setting
reliable to `true`, the reliable shim is used only in Chrome 30 and below.

- Updated docs and examples for TURN server usage
- Fixed global variable leak
- DataConnections now have reliable: false by default. This will switch to on when reliable: true works in more browsers