added basic node label attrib support to generate_data(); renamed label to label_name
if label_attrib is set, label_name must be provided as a fallback
added node label_attrib support to write_to_neo()
changed geoff item order in tests b/c labels are now added in the same loop as nodes
forgot to remove pudb call
oops, label_attrib doesn't need label_name as fallback.
Merge branch 'multidigraph' of https://github.com/arne-cl/neonx into multidigraph

Conflicts:
	tests/test_neo.py