Add Python code and example for COA block network traffic idiom
fixed cybox version on c2-ip-range
added coa/block-network-traffic
Merge branch 'block-network-traffic-idiom' of https://github.com/STIXProject/stix-documentation.git

Conflicts:
	idioms/course-of-action/block-network-traffic/index.md
Merge branch 'master' of https://github.com/STIXProject/stix-documentation.git
removed COA-to-block-network-traffic.xml