Resolve "add tracability attributes to grid (and maybe tile) files"

Closes #3

gridded_glm/libexec/_minute_gridder.py

@@ -201,7 +201,7 @@ def add_gglm_attrs(netcdf_filename, input_filenames):
         nc = Dataset(netcdf_filename, 'a')
         setattr(nc, 'cspp_geo_gglm_version', get_cspp_gglm_version())
         setattr(nc, 'cspp_geo_gglm_production_host', socket.gethostname())
-        setattr(nc, 'cspp_geo_gglm_input_files', ",".join(input_filenames)) # this probably needs to be added somewhere else?
+        setattr(nc, 'cspp_geo_gglm_input_files', ",".join([os.path.basename(f) for f in input_filenames]))
         nc.close()
     except:
         log.error("could not add CSPP Geo GGLM attributes to {}".format(netcdf_filename))