title: How to change colors in pie charts using canvasxpress
body: <p>I have a pie chart with two types of data: ok and not ok. I want to render ok with green and not ok with red. I have searched in the documentation but with no results. So far my code is:</p>
  
  <pre><code>new CanvasXpress("orderProgressCanvas", {
    "y": {
      "vars": [
        "Ok",
        "No"
      ],
      "smps": [
        "Percentuale completamento"
      ],
      "colorRGB": [
        "rgb(0,255,0)",
        "rgb(255,0,0)"
      ],
      "data": [
        [
          progress
        ],
        [
          100-progress
        ]
      ]
    }
  }, {
    "graphType": "Pie",
    "pieSegmentPrecision": 1,
    "pieSegmentSeparation": 2,
    "pieSegmentLabels": "outside",
    "pieType": "solid",
    "showLegend": false,
    "background" : "rgb(192,208,216)"
  });
  </code></pre>
  
  <p>But color definition doesn't work.. any idea?
  progress is a javascript variable from 0 to 100.</p>
  
  <p>Thanks</p>