Change: Display a progress indicator on delete.

Return a promise to display a progress indicator while deleting.

src/web/entities/container.jsx

@@ -175,7 +175,7 @@ class EntitiesContainer extends React.Component {
  handleDelete(entity) {
  const {deleteEntity} = this.props;
 
- deleteEntity(entity.id).then(this.handleChanged, this.handleError);
+ return deleteEntity(entity.id).then(this.handleChanged, this.handleError);
  }
 
  handleChanged() {