title: read_csv reads \, as a separator
body: <p>I know that <code>read_csv()</code> uses comma (<code>,</code>) as separator but I have a file which some of its cells has comma in their content.</p>
  
  <p>In that file author used backslash comma (<code>\,</code>) to show that this comma is not a separator.</p>
  
  <p>But when I read the file with <code>read_csv()</code>, it consider all commas as separator. Here is a sample row in csv file:</p>
  
  <pre><code>346882588,206801833,1049600263,Dzianis Dzenisiuk,5,StuckPixel\, Inc.,Feb 11\, 2010,2,3,1265846400
  </code></pre>
  
  <p>I know that there should be n columns so I read csv file line by line and remove extra commas and backslash commas.</p>
  
  <p>But there should be better way.</p>