haskell-wreq: broken, presumably by recent lens update

http://hydra.cryp.to/build/213420/nixlog/1/raw
haskell-twitter-conduit: jailbreak to fix build with latest version of 'lens'
haskell-snap: jailbreak to fix build with latest version of 'lens'
haskell-haskoin: jailbreak to fix build with latest version of 'lens'
haskell-json-assertions: jailbreak to fix build with latest version of 'lens'