ENH: add reverse kwarg for topo sort
MAINT: use reverse=True for some topological_sort calls
Fixes #1063.
Merge pull request #1064 from chebee7i/gmlbug

Fixes #1063.
Merge branch 'master' of github.com:networkx/networkx
Minor whitespace.
Update overview.rst

Seems that 'of' is needed ...
Merge pull request #1066 from sbellem/patch-1

Update overview.rst
Thanks.
Directed Gnp model (fast version) has wrong start index

For the directed graph version of the Gnp model the starting target has to be at v=0 not v=1 or no out-edges will ever be generated from node 0.
Fix failing test in planted_partition_graph

Update size to 218
Merge pull request #1056 from argriffing/reverse-topo-sort

ENH: add reverse kwarg for topo sort
needless iterating through the values of edge_dict twice when min accepts a generator expression
pep8 fixes around bellman-ford algo code
Merge pull request #1072 from jstnlef/min-to-take-generator

Returning the minimum weight from a multigraph was inefficient
Fix bug in Katz centrality algorithm that didn't s
Merge pull request #1077 from wkschwartz/fix-katz-centrality-err-msg

Show max iterations in non-convergence error for Katz centrality
before there was a duplicate call to remove_node when that should have been handled by a finally clause. Also added a test to verify that the size of the graph remains unchanged before and after the call to negative_edge_cycle
Merge pull request #1079 from jstnlef/negative_edge_refactor

Duplicate remove_node call should be handled by finally
Add highest-label preflow-push algorithm for maximum flow
Fix python3 compat in preflow-push maxflow algorithm