rg3/youtube-dl — pull request #3608 by naglis (2014-08-28 21:26:34+00:00)
Title: [promptfile] Add new extractor

Hi,
this adds an `InfoExtractor` for [PromptFile](http://www.promptfile.com/) and closes #3600.

Please review the regular expression used for thumbnail extraction, it's a bit dubious.

Other improvements and suggestions are very welcome.