music.youtube.com needs handling for the entire domain, not just /watch.
In addition the song title isn't always updated in the tab's title.
Hopefully both are fixed.

- Added support for music.youtube.com/watch
- The downloads are no longer incognito, and instead the download records get erased. The former caused errors, hopefully this will work better.

Updated the Nightbot url, since the beta part was removed.

This version adds an options page, accessible via the browser's addons page. This page allows you to define the name format for song titles, using {title} for interpolation.

The URLs of Nightbot song request pages can now have # at the end and still work properly, by only comparing the start of the URL.

Added song names from the Nightbot song requests page.

The behavior is also much more consistent - previously it would stop working without a page refresh in some situations.