Add Identifier Class for ORCiD

[mconlon17]

Currently ORCiD URI in VIVO are asserted to be owl:Thing only. We should have an ORCiD Class and assert the uri to be an individual in the class as in:

<orcidURI> a vivo:ORCiD .

(Unless there is an existing ontology that already defines ORCiD -- perhaps the WikiData ontology?)

The ORCiD can then be inferred to be an owl:Thing.

This is also https://jira.duraspace.org/browse/VIVO-1440

[mconlon17]

Medium Impact. Minor triple store upgrade -- add an ORCiD class assertion for every existing ORCiD. Minor software change to assert URI a ORCiD (rather than an owl:Thing). The inferencer then supplies owl:Thing and everything should work as expected.