use a cache in memory for the sync state
Proposed pull-req: https://github.com/leapcode/soledad/pull/264
(from redmine: created on 2015-09-21, closed on 2015-09-27)
Proposed pull-req: https://github.com/leapcode/soledad/pull/264
(from redmine: created on 2015-09-21, closed on 2015-09-27)