[Intl] Twig is not using bundled ICU data

Of course this is perfectly understandable, but it creates inconsistencies in the results...

e.g.

``` php
use Symfony\Component\Intl\Intl;

Intl::getCurrencyBundle()->getCurrencySymbol('MYR', 'en_MY');
// RM
```

vs

``` twig
{{ 100|localizedcurrency('MYR', 'en_MY') }}
{# MYR100 #}
{# twig/extensions - Twig_Extensions_Extension_Intl #}
```

with ICU 52 (Ubuntu 14.04 "trusty")
