Masking with conservative_normed

[jhamman]

@JiaweiZhuang - I'm reviving this conversation from #22. Where do you fall on this issue now?

[raphaeldussin]

I am able to get the results I want with the masking, however a big issue is that the mask is restricted to 2d. I think we should be able to handle at least 3d, maybe even 4d for wetting/drying

[rabernat]

When we last talked it seems like @raphaeldussin was willing to take this over.

Raf, starting from this branch, cloud you make a new PR to https://github.com/pangeo-data/xESMF?

[raphaeldussin]

@rabernat sure I'll take care of this one. It probably just needs a quick fix for conflicts since I was able to get the computation done.

[yuvipanda]

I think https://github.com/pangeo-data/xESMF/pull/1 overrides this, right?

[huard]

Yes, development for xESMF now happens in pangeo-data/xESMF