Renamed org.mongodb.WriteResult to org.mongodb.WriteConcernResult

 JAVA-1395
Move org.mongodb.WriteConcernResult to com.mongodb.WriteConcernResult

 JAVA-1395
Changed property type in WriteConcernException from WriteResult to WriteConcernResult

 JAVA-1395
Moved WriteResult from driver-core to driver

 JAVA-1395
Better fix for the race condition in DefaultServerMonitorSpecification