graph api changed to graph returns

...re/identification/african_easterly_waves/configuration.py

...feature/identification/african_easterly_waves/plotting.py

...ure/identification/african_easterly_waves/run_identify.py

enstools/feature/identification/overlap_example/example.py

enstools/feature/identification/template/example_template.py

enstools/feature/tracking/african_easterly_waves/tracking.py

...ools/feature/tracking/template_object_compare/tracking.py

enstools/feature/tracking/tracking.py

enstools/feature/util/graph.py