Add binary read functionality to websocket

[seyyah]

Usage:

In HTML/Javascript:

ws = new WebSocket('ws://IP_ADDRESS');
ws.binaryType = "arraybuffer";
var h = [0xfd, 0x01, 0x41, 0x81, 0xc1, 0xfe];
var m = [253, 1, 65, 129, 193, 254];
ws.send(new Uint8Array(h));

In serialport-server side,

$ serialport-server /dev/ttyUSB0
* websocket client (BINARY) <#{sid}> : "ý\u0001A\u0081Áþ"
* websocket client (BINARY) <#{sid}> : 253,1,65,129,193,254

Description:

$ irb
> h = [0xfd, 0x01, 0x41, 0x81, 0xc1, 0xfe]
> h.pack('U*')
"ý\u0001A\u0081Áþ"