updated installation document with info on how to install gephi, glpk and python-graph
updated installation document with info on how to install gephi, glpk and python-graph

pombredanne/nTLP,necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,pombredanne/nTLP,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control,pombredanne/nTLP