title: ggplot 2 facet_grid "free_y" but forcing Y axis to be rounded to nearest whole number
body: <p>When using: </p>
  
  <pre><code>facet_grid(SomeGroup ~, scales="free_y") 
  </code></pre>
  
  <p>Is it possible to specify that although you want the scales to be "free" you want them to be in rounded to the nearest whole numbers?</p>
  
  <p>Any assistance woudl be greatly appreciated.</p>