Added CERES examples where possible.  Fixes to other codes.

Some CERES examples not coded as of yet because they rely upon knowing
the integer ID of the dataset, which is not in the netCDF data model.

Removed gdal code path from LPDAAC/WELD example.
Modified LPDAAC/GED example to not use gdal.
Fixed lpdaac/mod hdf5 example.
Merge branch 'issue67' into devel