Reader: Add xkcd hover text within the reader

[dllh]

Steps to reproduce

1. Starting at URL: https://wordpress.com/
2. Subscribe to xkcd.com.
3. View the feed in the reader.
4. Hover over one of the delightful, clever comics.
5. Clutch your head in anguish as you discover that the hover text isn't pulled into the reader.

   What I expected

   • Wit
   • Occasional subversiveness
   • Title/hover/whatever text corresponding to what displays on xkcd.com

     What happened instead

No hover text. :( I miss it, like the deserts miss the rains.

Browser / OS version

Mac/chrome 53.0.2785.143 (64-bit) and the desktop app.

Screenshot / Video

Context / Source

Long ago, I used Feedly, and it did pull in these titles, so I know it's possible. I don't imagine most image titles matter all that much, but they're pretty much an essential part of the xkcd content, and I'd like to suggest that for this site, making sure we parse the title is worthwhile, even if only to delight the probably limited audience.

[blowery]

@dllh it's a step removed, but if you click on the card and open the full post view, the title is intact there. We just don't carry it along into the featured image preview.

[lancewillett]

Closing as "works as intended."