ENH: add blocktype to all relevant actions. Also default the rejection to a ICMP reject rather than a drop
BF: default type to unreachable
ENH: consolidate where blocktype is defined for iptables rules
DOC: ChangeLog for default action type change
Merge pull request #215 from grooverdan/reject_no_drop_by_default

ENH: add blocktype to all relevant actions and change default action to reject