replaced references to "STIX" with "CYBOX" in page title, heading, version column heading.
replaced references to "STIX" with "CYBOX" in page title, heading, version column heading.

made stix heading only show up for stix documents

supports issue #22

empereor/cvrf-to-html,empereor/cvrf-to-html,STIXProject/stix-to-html,empereor/cvrf-to-html,STIXProject/stix-to-html,STIXProject/stix-to-html,STIXProject/stix-to-html,empereor/cvrf-to-html