Use user-modified request during access logging.
Use user-modified request during access logging.

The client address may have been modified by X-Forwarded-For header, and
we should use the computed version instead of 127.0.0.1 in that case.

Should fix #90.

snapframework/snap-server,snapframework/snap-server,23Skidoo/snap-server,23Skidoo/snap-server,sopvop/snap-server,snapframework/snap-server,23Skidoo/snap-server,sopvop/snap-server