O fmt=opac deve retornar "fulltexts"
O fmt=opac deve retornar "fulltexts"

Faz com que o "fulltexts" volte a ser retornado

articlemeta/export.py

```
from articlemeta.client import ThriftClient
cl = ThriftClient()
article = cl.document(code='S0074-02761929000100003', collection='scl', fmt='opac')
article.data['fulltexts']

```

Retorno esperado:

```json
{u'pdf': {u'fr': u'http://www.scielo.br/pdf/mioc/v22n1/fr_tomo22(f1)_135-139.pdf', u'pt': u'http://www.scielo.br/pdf/mioc/v22n1/tomo22(f1)_135-139.pdf'}, u'html': {u'pt': u'http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761929000100003&tlng=pt'}}
```

n/a

Fixes #149

n/a

n/a

tk149

scieloorg/articles_meta