color: add borderLine color def
color: add borderLine color def

- used in update menus (but possible more layout components
  down the road).

asolagmbh/plotly.js,aburato/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,etpinard/plotly.js,plotly/plotly.js,iongroup/plotly.js,aburato/plotly.js,plotly/plotly.js,iongroup/plotly.js,iongroup/plotly.js,plotly/plotly.js,etpinard/plotly.js