Implement updates in the Claims Spec

[vdice]

From cnabio/duffle#882:

• created is required fix: formalize the field definitions on the Claims spec. cnabio/cnab-spec#295 - No changes necessary
• bundleReference is added add bundleReference to the claim specification cnabio/cnab-spec#299 - Changes in cnab-go; see feat(claim.go): add bundleReference property cnabio/cnab-go#189
• CNAB_CLAIMS_VERSION must be set in the invocation image - Changes in cnab-go; see feat(action): update CNAB_* env vars cnabio/cnab-go#192
• Claims must be mounted at /cnab/claim.json add CNAB_CLAIMS_VERSION and mount path for claim.json cnabio/cnab-spec#300 (edit: added to Porter in feat(*): add logic to resolve/interpolate output values in a Porter manifest #840)
• Revisit spec when implementing to see if there are other amendments needed: https://github.com/cnabio/cnab-spec/blob/master/400-claims.md

Note: Add to the cnab-go library where possible. The first handful appear to be likely candidates. Porter (like duffle) can then pick these up with library usage.

Additionally, coming down the pike (require updates when cnab-go release available):

• ref(*): change Name to Installation on Claim cnabio/cnab-go#181 (Claim Name -> Installation) No changes necessary in Porter
• Clarify pending status, introduce running cnabio/cnab-spec#340 -> Sync claim status names with the spec cnabio/cnab-go#197

[vdice]

The initial items that this ticket tracked either have been implemented or have open PRs to do so (nearly all cases the implementation was in cnab-go). Porter will inherit these when it bumps its cnab-go version. Closing.