### Please describe the problem.
The [podcasts page](https://git-annex.branchable.com/tips/downloading_podcasts/) mentions that you should be able to use `git annex importfeed` on youtube playlists, however, that doesn't seem to work (or I am using it incorrectly).

For example:

    » git annex importfeed --fast "https://www.youtube.com/playlist?list=PLz8YL4HVC87X3tYVYOjOLzSasPwgUsMPT"
    (checking known urls...)
    importfeed https://www.youtube.com/playlist?list=PLz8YL4HVC87X3tYVYOjOLzSasPwgUsMPT
    /var/folders/kb/fplmcbhs4z52p4x59cqgm4kw0000gn/T/f     [  <=>                                                                                                              ] 460.08K  1.87MB/s   in 0.2s

      warning: bad feed content
    ok

### What steps will reproduce the problem?

1. Enter a git annex repository
2. Attempt to import a youtube playlist feed (see command above) with `--fast`

### What version of git-annex are you using? On what operating system?

    » git annex version
    git-annex version: 5.20150205
    build flags: Assistant Webapp Webapp-secure Pairing Testsuite S3 WebDAV FsEvents XMPP DNS Feeds Quvi TDFA TorrentParser
    key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E MD5E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 MD5 WORM URL
    remote types: git gcrypt S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
    local repository version: 5
    supported repository version: 5
    upgrade supported from repository versions: 0 1 2 4

This is on Mac OSX 10.10.3, with git-annex installed via homebrew

> You have to give it an url to a RSS feed containing the playlist.
> 
> For example, `git annex importfeed
> 'http://gdata.youtube.com/feeds/api/playlists/PLz8ZG1e9MPlzefklz1Gv79icjywTXycR-'`
> still works despite there having been various news stories about youtube
> removing RSS functionality.
> 
> I've added this example to the documentation. [[done]] --[[Joey]]
