Angular HTTP save

gistfile1.txt

```
  # Set http authorization for all http (ajax) calls
  credentials = $("#credentials").val();
  if (credentials != "")
    $http.defaults.headers.common['Authorization'] = credentials


  $scope.deleteOnZeroQuantity = (item) ->
    if item.quantity is "0"
      $scope.job_invoice.items.splice $scope.job_invoice.items.indexOf(item), 1
      $http.put(invoiceItemURL + item.id, item)
        .error ->
          alert "Error: cannot update item"
```