Added data for the SOI filtering gallery example.
Merge pull request #1 from ajdawson/soi-example-data

Added data for the SOI filtering gallery example.
Updated sample data NetCDF files.
Merge pull request #2 from pelson/re_created_data_from_zoo

Updated sample data NetCDF files.
Polar Stereo file added to sample data
Merge pull request #4 from dannymet97/data_update

Polar stereographic GRIB2 file added to sample data.
Shorter file name for polar stereo
Merge pull request #5 from dannymet97/name_change

Shorter file name for polar stereo