Tests needed

-cmd/camput/
	-verify that stat caching works. verify that -filenodes does create the permanode even if the file was already uploaded (and cached) in a previous run.

-- blobserver/{cond,replica,remote,shard} have no tests. should be easier now
   that test.Fetcher is a full blobserver? see encrypt's nascent tests for
   examples.

-- app engine integration tests (before we make a release, for sure,
   but probably in presubmit)

-- cross-compiling to freebsd and windows etc still works.