title: Finding the most common values from given data
body: <p>I have some data that looks something like this...</p>
  
  <pre><code>+----------+----------+----------+
  | Column 1 | Column 2 | Column 3 |
  +----------+----------+----------+
  |   Red    |   Blue   |   Green  |
  |  Yellow  |   Blue   |   Pink   |
  |  Black   |   Grey   |   Blue   |
  +--------------------------------+
  </code></pre>
  
  <p>I need to go through this data and find the 3 most common colours.</p>
  
  <p>The raw data is in CSV and there's likely to be thousands more rows. (<a href="http://pastebin.com/fQuzt7HJ" rel="nofollow noreferrer">link</a>) </p>
  
  <p>What's the best way of doing this?</p>