blob: add RefFromString

Change-Id: I1e98874fd43c1570c2e79907dbdbc7e44ca64bf7
blobserver: add ReceiveString wrapper

Change-Id: I90a6bda084cb23af54047bf3288695c623a1894a
search: add Handler.Describe, make serveDescribe HTTP handler use it

Change-Id: I6f5a45b066aa02ad40cc7fdd2067ac6c178a62ab
importer: flesh out most of the Host/Object interface

Change-Id: Ia7e6ac3aa5e86bfa1fe950ad0c3944989c1d3f8a