Data input for loop detection algorithm

[jaber-the-great]

@sumaddury @cskitty Johnson and Tarjan loop detection algorithms issue: Instead of reading the edge information from the file and generating the graph, the code manually generates the graph. Should be corrected.

[cskitty]

The edge information reading from file was just for self-testing/checking the code worked in version 1; the actual running of the code is the function experiment 001 in the file Code/paper_code/experiment_4_paper.py

[jaber-the-great]

Got it. We may need more commenting and documentations in the code.