title: nvd3 line chart, how to remove gridlines and yaxis
body: <p>I have made a line chart with view finder. </p>
  
  <p>Here is my initial code </p>
  
  <pre><code>     var chart = nv.models.lineWithFocusChart();
  
   // chart.transitionDuration(500);
    chart.xAxis
        .tickFormat(d3.format(',g'));
    chart.xAxis
          .axisLabel("Date");
    chart.xAxis.tickPadding(0);
  
  
    chart.x2Axis
        .tickFormat(d3.format(',g'));
  
  
  
  
    chart.yAxis
        .tickFormat(d3.format(',.2g'));
    chart.y2Axis
        .tickFormat(d3.format(',.2h'));
   // chart.showYAxis(false);
  </code></pre>
  
  <p>I want to remove the y axis labels ( i.e. i want no number showing on the y axis).</p>
  
  <p>I also want to remove all the gridlines.</p>
  
  <p>is there something like chart.yAxis.somethinghere to do this?</p>
  
  <p>Thanks</p>