Graph weighted#12

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henrykh wants to merge 20 commits intomasterfrom

Commits on Feb 19, 2015

Commits on Feb 20, 2015

Commits on Mar 2, 2015

Commits on Mar 3, 2015

updates add edge, neighbors now returns a list
henrykh
committed

Commits on Mar 4, 2015

fixes neighbors test to check a list
henrykh
committed

Commits on Mar 5, 2015

adds iteritems to edge_dict in edges()
henrykh
committed