Bug fix for CVE-2014-0039

Bug fix for vulnerability CVE-2014-0039 reported by Murray McAllister of
the Red Hat Security Team in which an attacker-controlled fwsnort.conf
file could be read by fwsnort when not running as root.  This was caused
by fwsnort reading './fwsnort.conf' when not running as root and when a
path to the config file was not explicitly set with -c on the command
line.  This behavior has been changed to require the user to specify a
path to fwsnort.conf with -c when not running as root.
update to bundle the latest Emerging Threats rule set
bumped version to 1.6.4
bumped version and copyright info
added note about 'cat' usage
changes since 1.6.3