Update .npmignore to exclude all compiled images and tests. Fixes #3227
Update .npmignore to exclude all compiled images and tests. Fixes #3227
uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,vega/vega-lite