title: Cannot customize different Y axis in Google bar chart
body: <p>My google chart is made of a bar chart and a scatter chart, and so I use two different Y axis.</p>
  
  <p>I cannot specify different options for each Y axis.</p>
  
  <pre><code>{
      vAxis: {
        /* not taken into account... */
        0: {
          title: 'Y Left Axis',
          format: '#'
        },
        1: {
          title: 'Y Right Axis',
          format: '#'
        }
      },
      seriesType: 'bars',
      series: {
        4: {
          type: 'scatter',
          targetAxisIndex: 1
        },
        5: {
          type: 'scatter',
          targetAxisIndex: 1
        }
      },
      isStacked: true,
      legend: {
        position: 'none'
      }
  }
  </code></pre>
  
  <p>If I set the <code>vAxis</code> like below, it will use the same format and same title for the two axis...</p>
  
  <pre><code>vAxis: {
    format: '#',
    title: 'Same title will be used for the two axis...'
  }
  </code></pre>