Added parsing for exxon-format text files
Refactored the max_flow interface a bit and added max_st_flow
Add benchmark for graph_tool Boykov-Kolmogorov on complete graphs, and add a script for benchmarking different algorithms using Exxon graphs from text files
gitignore data directory
Initial commit for Nagamochi connectivity / Benczur sparsification algorithms; Nagamochi Ibaraki FOREST and CAPFOREST are backed by (3rd party) Fibonacci heap implementation
Add edge contraction; add code for computing min-cuts from max-flow residuals