1) Lower thread number multiplier for pull/push/fetch;
0.18.12
1) Limit state db size; 2) Limit size of the files state for which is going to be cached in the state db/file; 3) Speedup state db dump() speed x10 by using json.dumps() instead of json.dump();
0.18.11
1) Fixed bug in effective mtime calculation for dir trees; 2) Fixed bug in state dump when calculating checksum for directories;
0.18.10
1) Fix `dvc remote remove`;
0.18.9
1) Fix README.rst formatting on pypi; 2) Add `-y|--yes` option for `dvc run`;