Reddit: add support for eroshare links

[metaprime]

Some users have a fair amount of video and picture content hosted on Eroshare, and even though ripme has support for eroshare, we don't detect and rip eroshare content from reddit.

Example:
https://www.reddit.com/user/1rrationality/submitted/

The issue seems to be in non-album eroshare posts. Pages with single images, gifs, videos, seem not to be supported by the eroshare ripper, nor are links directly to the media files supported:

https://eroshare.com/i/j9b6wp5f
https://v.eroshare.com/j9b6wp5f.mp4
https://i.eroshare.com/oorsfw1q.jpg

But album links are supported by the eroshare ripper and are ripped as part of the user rip for the reddit ripper:

https://eroshare.com/bjkh353e

[metaprime]

See #526