* [instagram] Add support for GraphSidecar media types
Refactor _extract_postpage() to always return a list of medias.
Fetch common keywords and gracefully handle GraphSidecar media type
by extracting each single media and adding `sidecar_media_id' and
`sidecar_shortcode' keywords to indicate the parent of sidecar
childrens.
While here join the copyright comment lines in a single one.
Closes#178.
* [instagram] Use `yield from' instead of `for ... yield' (thanks @mikf)!
* [instagram] Adjust filename for GraphSidecar medias
Add a possible leading `media_id' of the sidecar for GraphSidecar
media.
Thanks to @mikf for the suggestion!
* [instagram] Add extra metadata for youtube-dl in GraphSidecar childrens
GraphSidecar children ytdl: URLs when consumed by youtube-dl
redirects to the URL of their parent. In GraphSidecar-s with
multiple GraphVideo-s this leads to downloading the same video
multiple times.
Add a `_ytdl_index' field to indicate the index of the youtube-dl
playlist corresponding the children of the sidecar.
This will be used by the `ytdl' downloader.
1e38f65996