Fixed Python3 basestring error in plotting.util
Fixed Python3 basestring error in plotting.util

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