[tei-council] Allow CORS requests on the vault

Hi all, Currently it doesn't seem to be possible to request files from the Vault via JavaScript. This is simple to solve by allowing CORS https://en.wikipedia.org/wiki/Cross-origin_resource_sharing on the server that holds the Vault, but the system admin will have to do that (Kevin?). I can't imagine this would be problematic: it would simply allow anyone building a JavaScript application to obtain any text, XML, and JSON file on the fly. It certainly would be convenient for the Roma replacement I'm working on. Any objections? Raff