Update feeder_generator_demo to include new object iteration

[Trevor Hardy]

Mitch has implemented a new method of iterating over all the object types in a model:

# returns a dictionary withs keys as object names
# value is dictionary with all the parameters and values for the named object
glmMod.model.<GLD object type> 
glmMod.get_object_vals(“<GLD object type>”)

I need to update the feeder_generator_demo to use these new APIs instead of the older, more obtuse version

[Trevor Hardy]

Integrated in release 1.3.2