Embed modal: added 'x' button, fix iframe URLs.
Embed modal: added 'x' button, fix iframe URLs.

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