Rework to use the new XStream & cycle Diverse

[SteveALee]

Stalz announced XSteam at #cycleconf http://staltz.com/xstream/

[SteveALee]

Can port to new DOM driver now

Import Cycle from '@cycle/rxjs-run'
import Rx from 'rxjs'
import {makeDOMDriver, div} from '@cycle/dom'

function main(sources) {
  return {
    DOM: Rx.Observable.of(
      div('Hello, world!')
    )
  }
}

Cycle.run(main, {
  DOM: makeDOMDriver('#app')
})