Fixes to Overlay nesting issues in bokeh plotting
Fixes to Overlay nesting issues in bokeh plotting

basnijholt/holoviews,ioam/holoviews,vascotenner/holoviews,ioam/holoviews,ioam/holoviews,vascotenner/holoviews,basnijholt/holoviews,vascotenner/holoviews,basnijholt/holoviews