Add human bytes conversion with maximum size (#7)

conf/config.sample.php

@@ -3,6 +3,6 @@
         define('_HTTP_PROTO','http');
         define('_HTTP_DOMAIN','localhost:8080'); // domain/IP with port if needed
         define('_HTTP_PATH','/');
-        define('_SIZE_LIMIT','2000000'); // in bytes
+        define('_SIZE_LIMIT','2097152'); // in bytes
         define('_PRETTY_URL', false); // Based on htaccess
 ?>