title: Jquery Post method and JSON issue
body: <p>I'm using jquery and jason sending data to another contoller, but when I send the data, I check it in fire bug and it's fine, It sends it correctly but in the target page, when I var_dump the <code>$_REQUEST</code> or <code>$_POST</code> is returns null.</p>
  
  <p>I'm using codeigniter by the way.</p>
  
  <p>This my jquery code:</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  function GetMovieLanguageCategory(Language) 
  {
   $.ajax({
    type: "POST",
    contentType: "application/json",
    url: "/admin/movie/get_language_category",
    data: JSON.stringify({"Language":Language}),
    success: function(Data)
    {
      alert(Data);
    },
    failure: function(ErrorMsg) {
    alert(ErrorMsg);
    },
  }); 
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>And in my Controller:</p>
  
  <pre><code>var_dump($_REQUEST);
  //var_dump(json_decode($_POST['Language']));
  </code></pre>
  
  <p>And it returns:</p>
  
  <pre><code>array(0) {}
  </code></pre>
  
  <p>Am I wrong somewhere?</p>