Updated protocol-facing code for new binary protocol

This is a squash of four boring commits. The gist is that client.js
encoding and decoding stuff was updated to take an array of encoded packets
to write, and to handle sequences of binary packets to decode. There was
also merging done with upstream. All tests are passing.
Updated protocol-facing code to reflect newest parser

Socket.io-parser now has a class-based Encoder and Decoder scheme,
so client.js was changed appropriately.

The main difference is that most of the logic for interpreting packets
is now isolated to parser, and client receives a 'decoded' event when
parser has a reconstructed packet ready to go.
Merge pull request #1432 from kevin-roark/add/better-binary-events

Updated protocol-facing code for new binary protocol