Unknown abbrevation: гп

Got "Unknown abbrevation: гп" exception today, here: https://github.com/evilmartians/fias/blob/master/lib/fias/name/canonical.rb#L7

Using this method to pretty-print fias-object's name, like 

```
def readble
  ::Fias::Name::Append.append(formalname, shortname).first
end
```

Am I doing it wrong? Should I add rescue there, or add abbrevation somewhere?
