added formatting edge and node scripts

getTweeters.py grabs the users and assigns a number to each user for
later use in genFollowerGraph.py

getConnections.py creates follower.json, by accessing twitter api. It
maps followers to a unique_integer for later use in genFollowerGraph.py
Creates Connections.json, which maps user --. [follower0,
follower1.....] for use in genFollowerGraph.py

genFollowerGraph.py is still in the process of being finished. Cycles
through each json file to create graph
Updated genFollowerGraph.py

Added in creating a directed_graph and calculating the directed
laplacian in  genFollowerGraph.py