Other TAXII issues in Github

[Bret Jordan <Bret_Jordan@symantec.com>]

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