[2.2] [Locale] add StubResourceBundle

```
Bug fix: yes (missing feature)
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -
```

 - Support `res` file, version `1.2`
 - Few change :
  - `Locale::getFallbackLocale` is now `public`
  - Skip the `StubCollator` in `Locale::getDisplayLanguages`, `getDisplayLocales`, `getDisplayCountries`

``` php
<?php
$collator = new \Collator(!extension_loaded('intl') ? 'en' : $locale);
```

Next Step : I think this can be useful for `StubIntlDateFormatter`