Added nxviz.io

With thanks to @RMKD, who provided this.

Edge colour update

Merged in a PR from @noragak that enabled edge colours.

Colorbar Update

In this release, I have enabled colorbars to automatically show up when plotting nodes with continuous-valued data stored on it. This should help with interpretation of the graph structure.

Applies to:

• CircosPlot
• ArcPlot

Noes not apply to:

• MatrixPlot

Still waiting for:

• HivePlot implementation to be completed.