pkg/client: better error handling propogation.

Convert non-200 HTTP responses into proper error objects returned to
caller.

Change-Id: Ib04fb8cf2e04d8ae85908233adc5f9e5f7b32d01
Fix the weird flicker on mouseover of thumbnails.

The effect you were seeing was a difference between hardware and
software compositing paths.

Chrome was promoting the content area to a hardware-accelerated
layer during animation, but dropping it back to software after the
animation was complete. There were little animations for the
checkmarks that were causing us to flip in and out of hardware mode
as you moused around.

Solution: force us to stay in hardware mode the entire time the
nav is open (translate: scale3d() is a well-known way to do this).

Bonus: the scaled text rendering looks better in hardware mode.

BUG: https://code.google.com/p/camlistore/issues/detail?id=284

Change-Id: I62f6c86d1ae12ba043f34c0659633bb5195dc50c
Remove unused NewSetAttributeClaim in RunCommand

Change-Id: I092020f675296e729e3dfe15d97a42682dd13ab9
Merge "Remove unused NewSetAttributeClaim in RunCommand"
Merge "Fix the weird flicker on mouseover of thumbnails."
Merge "pkg/client: better error handling propogation."
throttle: implement Read throttling TODO

Change-Id: Ia576dd694db48f85e43fdbded5000867bfde7b1a
Merge branch 'master' of https://camlistore.googlesource.com/camlistore