Add new props of scripts and metas

[shiyouping]

I added two new props that will generate script tags and meta tags. As I am not familiar with typescript, I am not sure if my modification to NewWindow.d.ts is correct or not. If not, please help me to correct it if you want to merge my changes. Many thanks.

[rmariuzzo]

@shiyouping I'm wondering if it would be better to delegate the inclusion of metas, scripts and other stuff to the consumer instead of this lib. We could consider adding a callback that return the window reference. With that ref we will allow other consumers to do whatever that please them with the opened window. wdyt?

Note: I'm aware on the time it took me to reply.