Added Portuguese Brazilian

[giovannibonetti]

I have added pt-BR.yml based on the rules I found at en.yml, es.yml and de.yml.
I am native Brazilian.

[coveralls]

Coverage decreased (-30.25%) when pulling 04dc19f on giovannibrazil:master into 57539de on kslazarev:master.

[kslazarev]

Could you translate some tests examples? Example in spec/numbers_and_words/integer/fixture_examples/en.yml. Make a copy and fill on Portuguese Brazilian, please. Also I want to make release on weekend (with Lithuanian and Portuguese Brazilian languages), so it will be great to get that commit as fast as possible.

[kslazarev]

Thanks for help and translations.

[giovannibonetti]

I see I have some more work to do... Well, I have just created a branch "feature/pt-BR.yml" and created custom fixtures for tests, so I hope next week I might get it at the level of reliability you need.
./.git/refs/heads/feature/pt-BR
./.git/refs/remotes/origin/feature/pt-BR
./.git/logs/refs/remotes/origin/feature/pt-BR
./.git/logs/refs/heads/feature/pt-BR
./lib/numbers_and_words/i18n/locales/numbers.pt-BR.yml
./spec/numbers_and_words/array/fixture_examples/pt-BR.yml
./spec/numbers_and_words/float/fixture_examples/pt-BR.yml
./spec/numbers_and_words/integer/fixture_examples/pt-BR.yml

[kslazarev]

For some interesting (strange) technical reason this pull request was closed. Not a big deal. You could create another one pull request when you have finished to fill some tests/logic.