new NCBI Nucleotide web translator

Using the Entrez Eutils JSON API. This is a translator for datasets, and therefore has some limitations, e.g. apparently no author information.
Use schema-relative URL. `//eutils.ncbi.nlm.nih.gov/...` Also use `encodeURIComponent` for anything you attach to the URL, so `... + encodeURIComponent(ids.join(',')`

Nits: `jsonURL` (spelling and Camel Case) and split into multiple lines for readability.