Format adjustments

vm-iso.json
* Addressed trailing commas on Notes element `"Notes": null,` >
`"Notes": null`
* Adjusted references element as discussed in #40
* Per #40 (comment)
change all property names to lower case as well.

online.json
* Added references element as discussed in #40 (moved
any references from notes to references).
* Per #40 (comment)
change all property names to lower case as well.
* Repointed hackazon to rapid7 (from NTOObjectives)

offline.json
* Added references element as discussed in #40 (moved
any references from notes to references).
* Per #40 (comment)
change all property names to lower case as well.

All three:
* Per #52 (comment)
& #52 (comment) the
technology element was changed to an array of strings.

Fixes #40