Add app name

[kocunop]

to correct mapping settings to JS, need variable type.

To work, you must specify app_name in urls.py or namespaces in include. docs

my use case:

<!-- Load settings -->
<script>
    {% for s in setty_current_app %}
        {% if s.type == 'string' %}
            var {{ s.name }} = '{{ s.value }}';
        {% else %}
            var {{ s.name }} = {{ s.value }};
        {% endif %}
    {% endfor %}
</script>

[mikeengland]

@kocunop thanks for the contribution. Would you mind looking at covering these changes with a couple of test cases? Thanks!