CSHARP-1094: Honor ReadPreference and MaxTime in MongoCursor Count and Size.
CSHARP-664: Deprecate MongoClient.GetServer() and remove MongoServer.Create() methods.
CSHARP-664: Converted some tests to use the new high level API instead of using #pragma to ignore the warning when GetServer is called.
CSHARP-664: Removed new extension method that was not worthy.
CSHARP-1074: Reimplement legacy MapReduce using an operation in Core. Add tests for MapReduceOperations.
CSHARP-1074: Reimplement legacy Aggregate methods using an operation in Core.
CSHARP-1074: Reimplement legacy AggregateExplain method on top of Core.
CSHARP-1100: Remove Command and ServerInstance properties from CommandResult.