[Merge] lp:~ssweeny/friends/fix-lp1258657 into lp:friends

[Robert Bruce Park]

Review: Approve

Buh. I've been putting this off because I was worried the fix would be harder than this (I forgot you could just do the urlencode before the signing, I thought I was going to have to tear up the Downloader class, and also oauthlib is generally a nightmare to deal with).

Thanks!
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https://code.launchpad.net/~ssweeny/friends/fix-lp1258657/+merge/206650
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