Support for native MongoDB driver

[lirbank]

This PRs makes the package work with the native MongoDB Node.js driver, as well as with mongoist.

The tests pass but I’ve not added any new to test with the native driver. Hope that’s OK?

[bradvogel]

can you add a unit test?

[ghmeier]

One potential problem I see with this is that it will provide unexpected results if the manofish/mongojs driver is provided since the instance of find there expects a callback.

[gastonelhordoy]

The callback is actually optional. Check the function return type and and code handling the missing callback.

[lirbank]

@ghmeier is manofish/mongojs a supported driver? I was under the impression only mongoist was supported. Would it be sufficient to update the README to point out the supported drivers are mongoist and, with this PR, native mongodb?

@bradvogel will update with unit tests soon (hopefully tomorrow).

[lirbank]

Ok, I've added tests and updated the README that the native driver is supported. Have a look and let me know if anything else is needed.

WRT the tests, I had some issues with looping the tests through both drivers. I couldn't manage to get the concurrency to operate correctly, so the tests where not reliably running with the correct driver (the driver was replaced in the before section before the tests had completed, stuff like that). Instead of spending more time on it I decided to just run the whole test suite two times, one for each driver, as you can see in package.json. Hope that's ok.

[bradvogel]

Great thanks! Will review in the next 2days. Sorry for the delay

[bradvogel]

Thanks! Released as 6.1.0.