When closing the window, disconnect instead of asking the user to do it
Ask confirmation before closing if user has unsent input
Merge pull request #432 from glowing-bear/disconnect-when-closing

When closing the window, disconnect instead of asking the user to do it
Create dark theme by extracting theme settings from glowingbear.css

* Remove style.css as those values should be themable as well.
* Update urls in index.html to link to dark theme by default
Provide a way to change the theme in the settings

* Selected theme is dynamically loaded
* Preferred theme is stored in the settings.
* Default theme = dark