Allow apps to add/modify config js output via hook.

core/js/config.php

@@ -64,6 +64,9 @@ $array = array(
 	)
 );
 
+// Allow hooks to modify the output values
+OC_Hook::emit('\OCP\Config', 'js', array('array' => &$array));
+
 // Echo it
 foreach ($array as  $setting => $value) {
 	echo("var ". $setting ."=".$value.";\n");