Add Regridding to lat-lon

[erogluorhan]

Regridding to lat-lon

Originally posted by @erogluorhan in #46 (comment)

[clyne]

Just adding a comment that Raphael Dussin (dussin@ucar.edu, @raphaeldussin) reached out to me at AGU and expressed interest in helping explore xESMF as a re-gridding:

GitHub - pangeo-data/xESMF: Universal Regridder for Geospatial Data

xESMF repo