Output logs are garbled when sending concurrent requests

[sgrif]

Steps to reproduce:

• Submit multiple concurrent requests to an application which is serving some content at /.

Expected behavior:

• Log output is grouped per-request, or at least uses line-buffering and includes sufficient information per-line to link that line to the relevant request.

Actual behavior:

• Logs are mixed in an unreadable fashion, such as:

GET /:
    => Matched: GET /
GET /:
    => Matched: GET /
    =>     => Outcome: Succcess
Outcome: Succcess
    => Response succeeded.
    => Response succeeded.

In particular, the => => Outcome: Succcess line seems especially undesirable.

[SergioBenitez]

Yes, this is indeed an issue that I'm aware of. I don't have a good solution yet, but I'll merge this in with the existing logging issue #21.