Other TAXII issues in Github

Please comment and review the following other Github issues:
Add clarifying text about media types on the manifest
https://github.com/oasis-tcs/cti-taxii2/issues/20
Get Object by ID needs to support pagination
https://github.com/oasis-tcs/cti-taxii2/issues/21
Add clarifying text about the date of objects in a collection that have versions
https://github.com/oasis-tcs/cti-taxii2/issues/24
Add clarifying text about using version filter
https://github.com/oasis-tcs/cti-taxii2/issues/25
Version key word 'all' should not be allowed when using multiple version parameters
https://github.com/oasis-tcs/cti-taxii2/issues/26
Bret