Dadah89/raw list

Implements `Cldr::Timezones.raw`:

```ruby
Cldr::Timezones.raw('pt-BR')['America/Sao_Paulo']
#  => ["São Paulo", "-03:00", "GMT"]
```

Also fixed few tests that started failing because offset changed for some timezones:

![Screen Shot 2013-03-10 at 10 58 12 PM](https://f.cloud.github.com/assets/697824/242471/548dca38-8a11-11e2-8ada-e5574a623d7c.png)

@anamartinez what do you think?