3 D plotting

[Shekharrajak]

Original : SciRuby/daru#154

• nyaplot 3d plotting

• highcharts 3d plotting : 3d pie chart example | just need to add options3d: {enabled: true,} options

• google charts 3d plotting : 3d pie chart example | just add is3D: true options

[v0dro]

Use camel case for options. So it should be is_3d and options_3d.

[Shekharrajak]

Options are used same as the how highcharts/googlecharts using. So I think it is better to not to change them. I will use is_3d for nyaplot 3d.

[Shekharrajak]

I see that Nyaplot 3d has only these 3d charts features : http://nbviewer.jupyter.org/github/domitry/Nyaplot/blob/master/examples/notebook/3DPlot.ipynb

which is not much useful. @v0dro Should daru-view use them ?