* Add `:mesh3d` seriesstyle for PyPlot backend
via `Poly3DCollection`.
* Add `:connections` to lists of supported keywords
for the backends which support `:mesh3d` as series type.
* Remove #47 from list of skipping examples for PyPlot
* Add support for only-triangle syntax for `:connections` kw
for PyPlot
* Add 1-based indexing syntax for `connections` kw in `:mesh3d`
* Update description for example `#47` (`:mesh3d`)
* Hotfix 1-based indexing for mesh3d in pgfplotsx