sometimes db_command can be an array (e.g. [findandmodify query, getlasterror query])
Moved _emitAcrossAllDbInstances to base
Added tracking of db instances across replset
More fixes to handle sets that never come back up during testing
Added huge insert and each test #950
Added test and fix for findAndModify with no chained getlasterror on w:0 and safe:false, #941
Merge commit '21c57fdec919b48439de08ab5ba84c7318a19373' into 1.3-dev
Fixes for gridstore close returning the gridstore object, added test #938