[Merge] lp:~kai-mast/friends/fetch-twitter-images into lp:friends

[Robert Bruce Park]

Please specify a default value for picture because python's None value i don't think will work. So:

  picture = url.get('media_url', '')

Oh and please add a test for this as well (look at the existing tests, you might have to add some extra json if there isn't already a media_url key present in the example data).
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https://code.launchpad.net/~kai-mast/friends/fetch-twitter-images/+merge/197556
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