Add ES6 proxy client

[SomeoneWeird]

import ht from 'hudson-taylor'

let transport = new ht.Transports.Local()
let service = new ht.Service(transport)
let client = new ht.Client({
  account: transport
})

service.on('getRandomAccount', function (data, callback) {
  return callback(null, {
    id: 4,
    name: 'you'
  })
})

let newClient = ht.proxy(client)

newClient.account.getRandomAccount(function (err, data) {
  ...
})

oooo yeaaa

[coveralls]

Coverage remained the same at 100.0% when pulling cbef8ad on proxy-client into ba4b029 on master.

[jasonk000]

nice

does anything prevent me from doing the below?

let accountSvc = newClient.account

accountSvc.getRandomAccount(function (err, data) { ... })

[jasonk000]

only question here is, does this work with try/catch and our previous double callback issues etc? I'm not familiar with Proxy

[jasonk000]

lgtm, do we need to add any test coverage?

[SomeoneWeird]

Looks like it should work:

> let { s: myService } = ht.proxy(c)
undefined
> myService.echo('hello!', console.log)
null 'hello!'

And yes! I thought I added tests, obviously not - will do.