Added custom package intents idiom. Closes #82.
Added idiom to index.md (commented out)
Modified the idiom to be all about controlled vocabs
Fixed a bug in the display
Merge branch 'master' into issue_82
Various updates

* Made less python-centric
* Fixed an unclosed tag
* Fixed the tab navigation
* Added example for custom vocab defined in STIX
Merge pull request #83 from STIXProject/issue_82

Issue 82