Add support for organisational IDs

[joncison]

Just GRID IDs for now, but could also be ROR.

GRID IDs was supported in biotoolsSchema 2..0.0

[joncison]

sample value:
grid.5170.3

[matuskalas]

In addition to GRID IDs, should also be DOIs (for funders), Ringgold IDs, and the ROR IDs.

+keeping an eye on the ongoing developments of the organisation ID initiative from ORCID+DataCite+CrossRef+etc.:

• https://orcid.org/content/2018-org-id-meeting
• https://orcid.org/content/organization-identifier-working-group
• https://orcid.org/blog/2018/02/02/next-steps-organization-id-initiative-report-stakeholder-meeting

[joncison]

Yes, and also FundRef IDs, see #114

For now, credit->gridId added.

I'm convinced (given many ID types) this will be better handled by replacing gridId, orcidId etc. with:

• credit->Id
  • credit->Id->value
  • credit->Id->type

i.e. as per the pattern used elsewhere, see #170