axis.js -- add def.properties by default
axis.js -- add def.properties by default

vega/vega-lite,jsanch/vega-lite,uwdata/vega-lite,sandbox/vega-lite,mendax-grip/vega-lite,ioriwellings/vega-lite,Ye-Yong-Chi/vega-lite,osnr/vega-lite,osnr/vega-lite,smartpcr/vega-lite,ellisonbg/vega-lite,freeman-lab/vega-lite,Ye-Yong-Chi/vega-lite,freeman-lab/vega-lite,ellisonbg/vega-lite,sandbox/vega-lite,vega/vega-lite,ioriwellings/vega-lite,osnr/vega-lite,freeman-lab/vega-lite,ellisonbg/vega-lite,uwdata/vega-lite,jsanch/vega-lite,mendax-grip/vega-lite,guiquanz/vega-lite,guiquanz/vega-lite,smartpcr/vega-lite,mathisonian/vega-lite,Ye-Yong-Chi/vega-lite,mathisonian/vega-lite,smartpcr/vega-lite,ioriwellings/vega-lite,uwdata/vega-lite,mathisonian/vega-lite,uwdata/vega-lite,vega/vega-lite,mendax-grip/vega-lite,vega/vega-lite,sandbox/vega-lite,jsanch/vega-lite,guiquanz/vega-lite,uwdata/vega-lite,vega/vega-lite