add 2D x and y support with new coords key
add 2D x and y support with new coords key

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