Moved MongoCommand to 'command' package
Renamed GetMore to MongoGetMore
Removed MongoOperation class. Added FindAndReplace tests. Fixed invalid behavior of Get.BeforeChangeApplied.
Removed MongoSave
Implemented DBCollection.remove(..., DBEncoder) and DBCollection.update(..., DBEncoder)
Implemented options in DBCursor
Renamed mongoGetMore to getMore in all files
Fixing unchecked warning in DBCollectionTest