title: Legend title position in ggplot2
body: <p>Anone know how to change the position of the legend title in ggplot?  </p>
  
  <p>I have used the following code to move the legend to the bottom and make it horizontal</p>
  
  <pre><code>p &lt;- p + opts(legend.position = 'bottom', legend.direction = 'horizontal')
  </code></pre>
  
  <p>But <strong>now I want the title to be to the left of the legend instead of above</strong>. I've looked in the follwing places but cant find it or figure it out:</p>
  
  <p><a href="https://github.com/hadley/ggplot2/wiki/Legend-Attributes" rel="noreferrer">https://github.com/hadley/ggplot2/wiki/Legend-Attributes</a>
  http://had.co.nz/ggplot2/book/toolbox.r</p>
  
  <p>Any assistance would be greatly appreciated</p>