Add label

add a new field on some pt object: label

the label is meant to be a better name. It contains for the stops and the poi the city:
for the administrative regions, it contains the range of the postal codes.

Also fix the name of the places to get the label if is exists.
```
from": {
    "embedded_type": "stop_area",
    "id": "stop_area:SCF:SA:SAOCE87543009",
    "name": "gare d'Orléans (Orléans)", <-------- label of contained object
    "quality": 0,
    "stop_area": {
        "administrative_regions": [
            {
                ...
                "id": "admin:45234",
                "label": "Orléans (45000)", <---- name of the city + postal code
                "level": 8,
                "name": "Orléans",
                "zip_code": "45000"
            }
        ],
    ...
        "id": "stop_area:SCF:SA:SAOCE87543009",
        "label": "gare d'Orléans (Orléans)", <------ name of the stop area  + city
        "name": "gare d'Orléans",
        "timezone": "Europe/Paris"
    }

},
```

for adress too we put the city:

```
"from": {

    "address": {
        "administrative_regions": [
            {
               ...
                "label": "Orléans (45000)",
                ...
            }
        ],
      ...
        "house_number": 7,
        "id": "1.9041324897365957;47.90821298299134",
        "name": "avenue de Paris"
    },
    "embedded_type": "address",
    "id": "1.9041324897365957;47.90821298299134",
    "name": "7 avenue de Paris (Orléans)",
    "quality": 0
},
```

fixes http://jira.canaltp.fr/browse/NAVITIAII-1101
I'd prefere "if there is one postcode that we cannot convert to integer, we put the raw string" to "if every postcode cannot be converted to int, we put the raw string"