GOES 15 MAGED numerical data

Adding GOES 15 MAGED numerical data for data at 1 and 5 m resolution.
Related to data at:http://satdat.ngdc.noaa.gov/sem/goes/data/new_avg/
Validated and passed URL check, but did not pass reference check.
Someone please check the GOES 15 EPS instrument meta data.

Signed-off-by: james weygand <jweygand@igpp.ucla.edu>