Add Django template syntax compatibility

The mustache support is a really nice feature. It would be great if the HTML beautifier also understood (and indented where required) Django template syntax.

Given the following:

{% extends "foo.html" %}{% block bar %}
{% for  in zulu %}<li><a>zulu</a></li>{% endfor %}
{% endblock %}

I would expect the output to be:

{% extends "foo.html" %}
{% block bar %}
    {% for  in zulu %}
        <li>
            <a>zulu</a>
        </li>
    {% endfor %}
{% endblock %}

[bitwiseman]

Django and related languages do not indent yet, but they are now supported in that they are not killed by beautification.

[bitwiseman]

@AdrienLemaire @antnieszka @jkevingutierrez PRs welcome. If you look at what is don’t for mustache and build around it, it should be possible.