Get rid of MONGO_METHOD() for MongoCursor->limit()
Get rid of MONGO_METHOD(MongoCursor, reset)
Get rid of MONGO_METHOD(MongoCursor, current);
Get rid of MONGO_METHOD() addOption
Remove MONGO_METHOD() for DBRef creation
Fixed CS based on PR review
Fix zts
Merged Pull Request #473

* pull-request/473:
  Fix zts
  Fixed CS based on PR review
  Remove MONGO_METHOD() for DBRef creation
  Get rid of MONGO_METHOD() addOption
  Get rid of MONGO_METHOD(MongoCursor, current);
  Get rid of MONGO_METHOD(MongoCursor, reset)
  Get rid of MONGO_METHOD() for MongoCursor->limit()