URL configuration arguments

[EmberHeartshine]

I saw in #57 you've added experimental URL import support as an argument in the URL. Would it be possible to have other configuration switches set by URL argument? For instance, the mode, editor, viewer, customizer, showAxes, and color states in the JSON response in the URL. This would make it a little easier to link to a specific layout state (even if it gets processed into the GZip keyboard-mashing in the end anyway).