blobpacked: parallellize StatBlobs

Change-Id: I61962befbc7adc9662b153077a1dd772a4bdbfa9
Update more (all remaining) issue links to Github.

Change-Id: Ia796410afb292615e63f7f42b5ecda3d18d7c325
Merge "blobpacked: parallellize StatBlobs"
Use the absolute diskutil path for unmounting

Unmounting a FUSE volume on Darwin fails if diskutil is not on one's
path. This is not the default on MacOS. Make the path absolute so that
FUSE volumes unmount successfully.

Change-Id: I255be19b5b12e3ebecffc6d29dc77b6504c27f1c
deploy/gce: use subdirs for config and blobs (instead of buckets)

http://camlistore.org/issue/528

Change-Id: Icb558d7de032f9367e8fb100be87ef24c2982c23
Merge "deploy/gce: use subdirs for config and blobs (instead of buckets)"
Merge "Use the absolute diskutil path for unmounting"
blobserver: simplify BlobStreamer interface, remove limitBytes

The caller can count on its own and cancel the context.

Also, I realize again that there's no HTTP interface for this yet, since
I didn't need to update one.

Change-Id: Ie3129bdb0dbc977c1803f18288e4d1e52e2d8478
More TODO

Change-Id: Idc04a985758eea2468f40b6c629cad4c81c95f1a
Add emacs+gofmt TODO

Change-Id: Ifaeea4769c6232564e04b821f12342fc241fd9b6
test: make Blob.Size return uint32, not int64

Change-Id: I5f262b4e1de5907c41a7cee8d4141f57ab0c1495