Add ORCIDs for all authors

[mbjones]

CRAN now supports ORCID identifiers in DESCRIPTION files to disambiguate authors. Let's add them for all contributors. I added examples for @mbjones and @gothub in sha 1294834. We need to find the rest.

• [x] Matthew B. Jones
• [x] Peter Slaughter
• [ ] Rob Nahf
  • No "Robert Nahf" at orcid.org, no orcid entry in dataone accounts. Sent email to address found via Google search and connected via LinkedIn, so will update if he sends back an ORCID.
• [x] Carl Boettiger
• [x] Chris Jones
• [x] Jordan Read
• [x] Lauren Walker
• [x] Edmund Hart
• [x] Scott Chamberlain

[mbjones]

Due diligence done. If we find the ORCID later it can be added. Closing issue.