In a Django development setup, it's common to have a /static/ URL set up
to serve static media to the browser upon request. That's usually set to
either serve out of a specific directory or out of any configured
finders. However, the former doesn't guarantee any referenced files were
collected first, and the latter only considers source files (for the
purposes of timestamp calculation/caching) and not the
collected/compiled files.

This change introduces a new view, meant for use with Django's static
serving view, that will collect the referenced file before serving it,
guaranteeing that media like images and fonts are present.

To ensure that this view will return content quickly (especially
considering it will serve up any files referenced by the template tags),
an optimization was made to Collector to allow the caller to collect
only the given list of files. The view makes use of this to handle the
collection process fast.