DOCUMENT-75: cstate param in my_fw::pre example should be state

Fixed!
Merge pull request #417 from jbondpdx/fix-readme

DOCUMENT-75: cstate param in my_fw::pre example should be state
Doesn't actually support OEL5

There are weird interactions between the version of iptables and the
kernel on OEL5.
Merge pull request #418 from mhaskel/remove_oel5

Doesn't actually support OEL5