Imgur: unable to rip subreddit-scoped album URLs

[metaprime]

These could probably be parsed the same way as imgur.com/a/* album pages, and single images (see #187), but rewriting the link to an album link doesn't seem generally workable.

https://imgur.com/r/Playboy/H7YkT (multi-image album) is equivalent to https://imgur.com/a/H7YkT

but

https://imgur.com/r/Playboy/lAdiQ (album with one image, not sure if this is significant) is not equivalent to https://imgur.com/a/lAdiQ (album with one image and the title is missing in this case)

and this one is a problem because it's not even an album:

https://imgur.com/r/Playboy/i2MvpGv (looks similar to a single-image album) https://imgur.com/i2MvpGv (but it's actually just a single image)

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RipMe does support subreddit aggregators already. Ensure they keep working.

https://imgur.com/r/Playboy/top https://imgur.com/r/Playboy/new

https://imgur.com/r/Playboy/top/all (year, month, week, day)

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Work items:

• [x] https://imgur.com/r/Playboy/H7YkT (multi-image album) (8a70adbb05619994cf000c05be7d47680a3bddec)
• [x] https://imgur.com/r/Playboy/lAdiQ (album with one image, not sure if this is significant) (8a70adbb05619994cf000c05be7d47680a3bddec)
• [ ] https://imgur.com/r/Lobo2ffs/jCBSP/ (10 image limit problem, not a problem for the equivalent album: https://imgur.com/a/jCBSP/)
• [ ] https://imgur.com/r/Playboy/i2MvpGv (actually just a single image, pending #187)