fixup! 134d993 Remove PassengerGroup/User

Not available in Debian version of passenger
fixup! 134d993 Remove PassengerMinInstances

Not available in Debian version of passenger
Add link to Passenger performance tuning guide
fixup! 134d993 use apache2 rather than httpd for log dir

For dumb Debian convention
fixup! 134d993 Use easier to set up log dirs

Using alaveteli subdir means more setup; easier to just prefix the file name with alaveteli. Also use .log rather than _log to keep with original access.log and error.log convention.