Update init-script with lsb init functions

* Added LSB headers (borrowed from Ubuntu's init script) - fixes #2
* Replaced most `echo` calls with lsb logging functions
* Testing return codes from `iptables-restore` & `iptables-save`
Reordered lsb logging around fail2ban stops/starts; fixed $modules var used in init script
rename modules to MODULES for consistency
Merge branch 'EvanK-patch-1'