Add original source metadata to OmicsDI

[flaneuse]

Since OmicsDI is a metadata repository, it would be good to save the provider information in the sdPublisher field. so for this record it'd be something like:

sdPublisher: [{
      name: "BioStudies",
      identifier: "S-EPMC3841080",
      url: "https://www.ebi.ac.uk/biostudies/studies/S-EPMC3841080"
      }]

it looks like that info comes from a zipping of repository and full_dataset_link (though database is also related)?