S3Boto3Storage as a staticfiles storage

[WhyNotHugo]

Using storages.backends.s3boto3.S3Boto3Storage as a staticfiles storage work fine, however, it breaks with DEBUG=True, since it generates URLs for the storage. One would need to run collectstatic after every file-save, and this takes a couple of minute (which ends up being the opposite of a live reload).

In the past, I've worked around this by using a different storage when DEBUG=True, but this just leads to other issues due to inconsistent settings.

I'm wondering if anyone has worked on a S3Boto3StaticfilesStorage storage, which uses STATIC_URL in development, and does the usual on production.

[jschneier]

To fix issues that have come up around url() I added a new staticfiles storage in #968. That could be extended with any new hooks or parameters that are needed.