Rubberband plugin for d3

Wrote a d3 plugin which gives your linecharts dashed rubberband to guide.

This actual demo is here, http://tmtk75.github.io/d3.svg.rubberband/.

Here is a screenshot.

It's based on an example of d3, http://bl.ocks.org/mbostock/3883245.

About the detail, see the README, https://github.com/tmtk75/d3.svg.rubberband/blob/master/README.md.