Fixes: #88 and docs

Thank you for this PR! The integration tests are failing with the new changes. Can you please modify the integration tests such that they test for the new functionality?

I've been doing some research on how to fix the integration tests and I've been unable to find a method of normalizing slashes using rewrite rules that will preserve the requested schema, hostname, and port. I think we may have to implement this in njs. I did a in njs and it was relatively simple to normalize the uri requested to S3, but it does not result in a HTTP 302 redirect to the client. I'll update as I discover more.

I have not taken a a look yet at the integration tests yet, but if the njs solution serves the content correctly even if it doesn't rewrite the URL / redirect in the client I think that's a valid solution.

In a previous unsuccessful attempt in njs I was getting 404 errors after normalising "uri_path" variable.

I tried updating the integration tests to expect a 302 code redirect when there is a double slash, but I am getting a error code return 7 from the run, without much detail

@dav-pascual - I'm traveling right now, so it will be a while until I can engage on this.

reviewed