Add programmatic export utility based on selenium and chrome-headless #554
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This allows you to save altair charts to PNG without going to the browser.
Dependencies can be installed this way:
Then you can use the utility this way:
Eventually we can make this more streamlined for the user (e.g.
chart.save('mychart.png')
) but we'll have to figure out the dependency story... and I wanted to get the initial version of this utility committed so that I can use it to build docs for the release candidate.