Regridding library for PyCNAL
Requires :
* python2/3
* numpy, matplotlib, netCDF4
* ESMPy https://www.earthsystemcog.org/projects/esmpy/
For help compiling ESMF/ESMPy, see :
https://gist.github.com/raphaeldussin/800a46d1cbad23b3874a668308d84816
https://gist.github.com/raphaeldussin/eca2594a314287876ebb3273ddc1dfc1
https://gist.github.com/raphaeldussin/f80d99703ffd84e3c9bf4510a2137d8a