rework index
rework index

sdiehl/write-you-a-haskell,FranklinChen/write-you-a-haskell,sdiehl/write-you-a-haskell,sdiehl/write-you-a-haskell,FranklinChen/write-you-a-haskell,yupferris/write-you-a-haskell,yupferris/write-you-a-haskell,FranklinChen/write-you-a-haskell,FranklinChen/write-you-a-haskell,yupferris/write-you-a-haskell,sdiehl/write-you-a-haskell,yupferris/write-you-a-haskell,yupferris/write-you-a-haskell,yupferris/write-you-a-haskell,FranklinChen/write-you-a-haskell,FranklinChen/write-you-a-haskell,sdiehl/write-you-a-haskell,sdiehl/write-you-a-haskell