Gw ignore mongo

The mongoDB version is not being run anymore. The driver has an issue that makes it really slow, so there isn't any point to running the mongo version until that is fixed.

I think Mongo would need CPP to exist in the same file now unless they changed how their testing setup works (which they may have) because MongoDB always has a field named `_id` as the primary key and it cannot be renamed. You can just comment out the MongoDB code instead of using CPP if you want. I did not compile this code.