code: function makeStubMotionDriver() {
    return function fakeMotionDriver(shouldPause$) {
      const events$ = Observable
      .fromPromise(jQuery.ajax('../data/samples-1.csv'))
      .concatMap(points => {
        const data$ = TestDataStream('rxjs')
        .pointsAsRealtimeStream(points)
        return data$;
      })
      .pausable(shouldPause$);
      return { events: events$ }
    }
  }
docs: Stub Motion (accelerometer) driver
  
  Responsible for simulating a human moving (or running).
  
  Input: shouldPause$ stream, indicating whether the driver
  should continue producing data or whether it should ignore
  'live' data on the fixture stream.