title: Matplotlib multiple colours in tick labels
body: <p>Is it possible to have an tick labels formatted with different colours within the label</p>
  
  <p>eg Using labels like this:</p>
  
  <pre><code>labels = ['apple - 1 : 7', 'orange - 5 : 10']
  </code></pre>
  
  <p>Such that the numbers 1 &amp; 5 appear blue and 7 &amp; 10 appear red?</p>