Command utility improvements (#1609)
Command utility improvements (#1609)

* Added conditional imports to support different uses of the script

* Added hash bang line to top of command script

* Explicitly directing print output to stdout

* Improved the usability of the holoviews command with argparse

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