Expose edgecolors for 3D surface plots
Expose edgecolors for 3D surface plots

Because the default style in mpl 2.0 was changed from 'k' to 'w' I exposed the `edgecolors` style option to change it back if wanted.
ioam/holoviews,ioam/holoviews,basnijholt/holoviews,basnijholt/holoviews,basnijholt/holoviews,ioam/holoviews