Only load ol.css in loader.js

Before this change, all the examples try to load ../css/ol.css, even in
hosted mode, where they should load ../build/ol.css instead.

examples/loader.js

@@ -59,6 +59,7 @@
     pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(params[key]));
   }
 
+  document.write('<link rel="stylesheet" href="../css/ol.css" type="text/css">');
   var url = 'http://' + host + '/compile?' + pairs.join('&');
   document.write('<script type="text/javascript" src="' + url + '"></script>');
 }());