New endpoint: about

[mycrobe]

We should publish an endpoint to provide information about gramene.

• Blog posts, /news
  • Proxy drupal RSS feed
  • No query parameters
  • XML response only
• Releases, /releases
  • Returns array of Gramene release documents, including links to release notes and any sites that might still exist (i.e. versions of data.gramene.org), status flag with possible values prerelease, current, archived.
  • Optional URL-based query fields, so /releases/current and /resleases/prerelease return a single document
  • Suggestsed format for a single doc

{
  "release": "50",
  "release_date": "<zulu time JS date string>",
  "status": "current",
  "ensembl_release": "83",
  "webservice_endpoint": "http://data.gramene.org/v50",
}