Ensure consistent output ordering

[PeterJCLaw]

Since the output file is one which we assume that people will put into version control, they're probably also going to want it to be stable and have CI validating it being up to date.

[graingert]

I think a neater fix is to use an OrderedDict in https://github.com/ierror/django-js-reverse/blob/master/django_js_reverse/core.py#L110-L121

eg:

def generate_json(default_urlresolver, script_prefix=None):
    if script_prefix is None:
        script_prefix = urlresolvers.get_script_prefix()
    urls = sorted(list(prepare_url_list(default_urlresolver)))

    return collections.OrderedDict(
        [
            (
                'urls',
                [
                    [
                        force_text(name),
                        [
                            [force_text(path), [force_text(arg) for arg in args]]
                            for path, args in patterns
                        ],
                    ]
                    for name, patterns in urls
                ],
            ),
            ('prefix', script_prefix),
        ]
    )

because there's only 2 keys in the whole data structure

[coveralls]

Coverage increased (+0.002%) to 99.087% when pulling 93dbc29 on PeterJCLaw:consistent-output into ba8ce52 on ierror:master.

[coveralls]

Coverage remained the same at 99.085% when pulling f089577 on PeterJCLaw:consistent-output into ba8ce52 on ierror:master.

[PeterJCLaw]

I think a neater fix is to use an OrderedDict in https://github.com/ierror/django-js-reverse/blob/master/django_js_reverse/core.py#L110-L121

because there's only 2 keys in the whole data structure

Yeah, I considered using an OrderedDict but decided against because sort_keys will ensure that the whole structure is always consistent, rather than making this a feature which the structure itself needs to maintain (I realise the structure already kinda has to do this for the list parts, so maybe this isn't a strong enough reason).
I agree it doesn't feel obvious that the _safe_json helper handles this though.

[PeterJCLaw]

Anyway, 93dbc29 changes to using an OrderedDict.

[PeterJCLaw]

@graingert just so I know roughly what to expect -- what's the normal release cadence for this project?