Description:
------------
I currently use the \ResourceBundle class from the intl extension. After an upgrade to 5.3.6 some essental keys were missing.

Before i used a ICU4C data library for 3.8.1, after the upgrade i noticed ICU version upgraded too (4.4.1). Using \ResourceBundle with the new data library results in unknown keys, downgrading the data library resolves it.

Created the data library at;
http://apps.icu-project.org/datacustom/ICUData38.html
http://apps.icu-project.org/datacustom/ICUData44.html

See also;
http://site.icu-project.org/design/resbund/issues

Test script:
---------------
<?php
$res = new \ResourceBundle('en_US', '/usr/data/icu381', true);
var_dump($res->get('Languages'));
var_dump($res->getErrorMessage());

$res = new \ResourceBundle('en_US', '/usr/data/icu441', true);
var_dump($res->get('Languages'));
var_dump($res->getErrorMessage());

Expected result:
----------------
object(ResourceBundle)
"U_ZERO_ERROR"

object(ResourceBundle)
"U_ZERO_ERROR"

Actual result:
--------------
object(ResourceBundle)
"U_ZERO_ERROR"

NULL
"Cannot load resource element 'Languages': U_MISSING_RESOURCE_ERROR"