kv and deps: update to fix read problem on windows

github.com/cznic/kv rev: c966980e3e8456175d4407fcbb0287057d9d0862

http://camlistore.org/issue/214

Change-Id: I15d658710059c823b775db6cc6fa14c1a32b98fb
add a TODO

Change-Id: I653b5cea785ba08455e84e06f01734a6d384f240
Merge branch 'master' of https://camlistore.googlesource.com/camlistore