added uniform graph code, for SIR model

added barabasi albert model to graphs, under construction

added __init__.py

finished BA graph generator, needs testing

finished BA graph generator, needs testing; cleaned print statements

added examples for cascade models

changing to branch master

merged master into branch

comitting before pull

BA generator now takes seed graphs using optional argument seed_graph, finished BA_cascade example

changed graphs directory to graph_generators

commented all the code

commented all the code

fixed variable names, added more comments, cleaned up old commented code

commented the graphism/examples code

added modular cascade example

added tp and rp change to BA cascade

minor changes

added uniform graph code, for SIR model

added barabasi albert model to graphs, under construction

added __init__.py

finished BA graph generator, needs testing

finished BA graph generator, needs testing; cleaned print statements

added examples for cascade models

changing to branch master

merged master into branch

comitting before pull

BA generator now takes seed graphs using optional argument seed_graph, finished BA_cascade example

changed graphs directory to graph_generators

commented all the code

commented all the code

fixed variable names, added more comments, cleaned up old commented code

commented the graphism/examples code

added modular cascade example

added tp and rp change to BA cascade

small changes to BA_cascade and SI_model

moved examples to appropriate directory

fixed BA_cascade.py merge conflict

fixed merge confict in SI_model.py

made changes according to pull request feedback

fixed examples after changes

renamed directories and code for graph generators, fixed examples

removed argument descriptions

cleanups to barabasi_albert generator

Cleanups to uniform graph generator
Merge pull request #20 from akellehe/graph_generators-rc1

added uniform graph code, for SIR model