Test NetCDF notebooks

Two NetCDF Files from http://www.archive.arm.gov/discovery/#v/results/s/s::kazr

SGP site cloud pre-analysis
April 19, 2014 - Small Non-Precipitating Clouds (Daytime)
June 2, 2014 - Large Precipitating Clouds (Nighttime)

Dates from http://plot.dmf.arm.gov/plotbrowser/