WebSerial spec updated

[monteslu]

I have a working implementation here: https://github.com/monteslu/p5.j5/blob/master/src/browser-serialport.js

Also some relevant discussion here: monteslu/p5.j5#5

Maybe it's time this stuff got put into an official capacity and browserifiable to node-serialport ?

[ja0n]

that would be really useful! I downloaded the file you linked and got it working with firmata-io with almost no change. really awesome!