Send all pictures from multi-upload Facebook post

[pxdl]

Currently the bot only sends the main picture of a post if it finds a multi-upload "photo" post.

[olga-black]

In my fork I've been implementing the multi-photo sharing option. Currently it only shares up to 10 photos per post cause it's the maximum Telegram allows. I keep working on this issue and wanna share them in multiple groups of 10s. However, Facebook's Graph API doesn't let you access more than 12 photos for one post anyway, unless you access them through the album.