Added "Last Modified" field to directory listings

Automatically generated listings of directories (via the bin/list ->
bin/list.pl utility) now include an extra column for time last modified.
Fixed an issue with HTTP 304 Not Modified

Fixed a potential erroneous 304 if content is requested multiple times
from the same connection thread and has changed between requests.
Merge branch 'master' of https://github.com/krakissi/kraknet

Conflicts:
	bin/list.pl
	src/serv.c
Merge branch 'master' of https://github.com/krakissi/kraknet
Merge branch 'master' of https://github.com/krakissi/kraknet
Merge branch 'master' of https://github.com/krakissi/kraknet
Adding Bogus Accounts Module

Every page rendered with Kraknet will generate an error in logs/cgi.log
due to the missing accounts:auth module. Until the accounts system is
merged with the main server repository, this module will provide a
script for Kraknet to run which always returns NO.