title: CodeIgniter and PHP 5.5.14 - mysql_escape_string() issue
body: <p>I've this issue after setting up CodeIgniter with PHP 5.5.14</p>
  
  <pre><code>A PHP Error was encountered
  Severity: 8192
  Message: mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead.
  Filename: mysqli/mysqli_driver.php
  Line Number: 320
  </code></pre>
  
  <p>It seems that mysql_real_escape_string() functions has been deprecated on 5.5.14, right?</p>
  
  <p>CodeIgniter have no compatibility with this PHP version??</p>
  
  <p><strong>Any ideas??</strong></p>
  
  <p>Thanks in advance!</p>
  
  <p>Giovanni</p>