Update header.php

Realizando cambios para adaptarlo en dispositivos móviles: 
<!-- /Responsive Desing Web/-->
        <meta name="viewport" content="initial-scale = 1.0, maximum-scale = 1.0, user-scalable = no, width = device-width">
        <!–[if lt IE 9]>
        <script src="http://css3-mediaqueries-js.googlecode.com/svn/trunk/css3-mediaqueries.js"></script>
        <![endif]–>
        <!--responsive-bireme-->