Allow configuring a different reloader

[dstufft]

Currently the only way to customize the Reloader implementation is to either monkeypatch it or subclass the worker. It would be great if there was a way, even if it was only really available via gunicorn.app.base.Application subclassing, to configure our own Reloader.

Alternatively a way to specify additional files (maybe with a glob?) would be useful instead.

[berkerpeksag]

We probably can add a reloader_class attribute to gunicorn.app.base.Application.

[tilgovi]

Even just assigning the new Reloader instance to self.reloader would make it available to the post_worker_init hook. The Reloader has a method add_extra_file.

Would that be sufficient for what you need for this issue or do you really want to customize it in some other way?

[dstufft]

That would be good enough for what I need it for I believe.

[tilgovi]

Done.