Merge pull request #27 from rkp8000/master

Quick_net function in network_gen.py & new random graph generator.
updated edge lesion
added whole graph average metrics function
fixed bug in whole graph lesion stats
pep8
added graphing functionality, fixed bugs
fixed bugs in network stats function
Merge pull request #28 from rkp8000/master

Add script and functions to calculate cost of brain wiring.
Merge branch 'master' of https://github.com/wronk/dbw
updated lesion_node function to take node names instead of indices
fixed indexing bug
remove print statements
add isolates
finished first draft of functional plotting
Merge pull request #29 from rkp8000/master

Add global 'all_paths' cost function and looping over number of swaps.
Add function to get all centroids.