Enable hooks and implement global login checking

Controllers that have to be publicly available can be
introduced in application/hooks/global.php

application/config/config.sample.php

@@ -91,7 +91,7 @@ $config['charset'] = 'UTF-8';
 | setting this variable to TRUE (boolean).  See the user guide for details.
 |
 */
-$config['enable_hooks'] = false;
+$config['enable_hooks'] = true;
 
 
 /*

application/config/hooks.php

@@ -10,6 +10,12 @@
 |
 */
 
+$hook['post_controller_constructor'] = array(
+	'class'    => '',
+	'function' => 'check_login',
+	'filename' => 'global.php',
+	'filepath' => 'hooks'
+);
 
 
 /* End of file hooks.php */