Adding postal code format for Brazil

Very straightforward. Brazilian postal codes consist of 8 digits, optionally separated by a hyphen after the first 5 digits. [Data from Google](http://i18napis.appspot.com/address/data/BR). 

__Proposed format__
`^\d{5}[\\-]?\d{3}$`

__Examples__
- 40301-110
- 70002900