Create file for printing node & edge lists. Edit areas_by_rank_script to use this file.
Add node-edge overlap function to network compute. Implement this in areas_by_rank_script.
Touch up.
Make library for printing things (equivalent to lirary for plotting things) about general network. Move area collection functions to their own module. Edit areas_by_rank_script to use collect_areas module.
Merge pull request #14 from rkp8000/master

Write functions for printing out import nodes/edges.