url-to-image renders every URL I try except the one I need

I'm trying to implement the apparently useful and powerful url-to-image module. Using the basic example script, I can render and save as a .png any website I try except the one I need, which uses angular.

I need something past the login page, but I can't even render the login page: http://ift.tt/2jJEzWt.

Any ideas on how to make this module work for this URL? Or ideas on another tool to render an image of a page such as this?