First little bit of Flickr importer.

Change-Id: Ia42b07a81b01904f5722d06653c4bf9de2e81c64
Merge "First little bit of Flickr importer."
importer: initialize Host's search handler and blobserver target

Change-Id: I482e6f192620c254648b19b3044eedbd44de288c
Merge branch 'master' of https://camlistore.googlesource.com/camlistore