Expose required headers for CORS requests
Expose required headers for CORS requests

The Link and Link-Template headers are necessary for clients to discover
linked resources. Per the CORS spec, these must be allowed explicitly by
the server.

Signed-off-by: Byron Ruth <e9d71f5ee7c92d6dc9e92ffdad17b8bd49418f98@devel.io>

chop-dbhi/serrano,chop-dbhi/serrano