title: jqPlot tickInterval simple issue
body: <p>I have a normal chart with yaxis such as below</p>
  
  <pre><code>yaxis: {
          show:true,
          min:0,
          max:10000,
          tickInterval: 100
         }
  </code></pre>
  
  <p>but it starts with 0 and moving up by 100 till reaches 10000 but I want the yAxis to go up by 
  multiple of 10 such as below:</p>
  
  <p>0, 10, 100, 1000, 10000</p>
  
  <p>is that possible?</p>
  
  <p>Thanks,</p>