#30 Add extra information to access.log

[Daniel Mealha Cabrita]

Extra fields that are interesting to add to access.log:

HTTP return code (200, 404 etc)
Content-Type

Logging non-HTTP-200 accesses aswell (404, other).

[Daniel Mealha Cabrita]

Timeouts should also be logged.

[Daniel Mealha Cabrita]

ziproxylogtool must the updated in order to support both old and new formats.
the example html statistics generator will probably need changes.