BF: change GraphPartition to use set(range(number_of_nodes)) as _node_set, not nodes defined in graph to avoid index error when using this to index adjacency_matrix
BF: change GraphPartition to use set(range(number_of_nodes)) as _node_set, not nodes defined in graph to avoid index error when using this to index adjacency_matrix

stefanv/brainx,nipy/brainx,jrcohen02/brainx_archive2,whitergh/brainx