Named extension schemas more specifically for what they do
Updated:Named extension schemas more specifically for what they do
Merge branch 'issue_17' of https://github.com/JWParlee/schemas-1 into JWParlee-issue_17

Conflicts:
	course_of_action.xsd
	data_marking.xsd
	exploit_target.xsd
	incident.xsd
	indicator.xsd
	stix_common.xsd

Fixes #17