Allow files to be named and displayed on the screen

[jangeador]

The way the app works right now is that you either set a nice filename or you leave it blank and the pdf displays on the screen. Can we add a flag like show_content_in_browser which will allow the dev to set a nice filename and display on the screen at the same time.

I am willing to add this myself if the project admin(s) are interested. Please let me know.