rg3/youtube-dl — pull request #2266 by MikeCol (2014-01-28 19:32:24+00:00)
Title: Retrieve the URLs of all availale thumbnails

The clips on Tumblr pages are usually accompanied by more than one thumbnail. Their URL is stored in an array in the source code of the page.

This patch decodes this array in its entirety and returns their URL under the *thumbnails* key.
It also returns the first URL under the *thumbnail* key.