v0.4.1

NamedGraphs v0.4.1

Diff since v0.4.0

Merged pull requests:

• Define rename_vertices for SimpleEdge (#65) (@mtfishman)

Closed issues:

• Graph partitioning (#25)
• Out-of-place add_vertex, rem_vertex, add_edge, rem_edge (#55)
• Don't reexport anything from Graphs.jl (#58)
• Naming convention for NamedGraph graph generators (#60)
• Move KaHyPar and Metis to package extensions (#62)