Facture payroll

Finalisation de la réimpression des factures
This code is sub-optimal, and unclear.  I suggest making the code clearer, and re-submitting a pull request. For example, you can write this:

```javascript
var invoice = $scope.invoice = {},
      location = model.location.pop();
invoice = {
  village : location.village,
  sector : location.sector,
  // etc ...
};
```