SERVER-12328 less aggressive plan cache evictions when the stddev is small
SERVER-13067 fixed typo in log message for clearing plan cache
SERVER-12902 number of required fields in parsed projection should be 1 when projecting {_id: 1}
SERVER-12902 disallow queries with projections for id hack
SERVER-12902 extended ID hack to support {_id: 1} projection
SERVER-12902 moved canUseIDHack from getRunner to IDHackRunner
SERVER-12929 propage error from GeoQuery::parseNewQuery to expression parser
SERVER-12901 fix flapping test
SERVER-12981 handle $and/$nor/$or under $elemMatch