Commits on Apr 1, 2018

1. Fix derived Inject instance for sum types …

   Related to #346
   
   This fixes the `GenericInject` instance for a sum type with two
   constructors to include the type of the alternative constructor.  For
   example, before this change you would get the following incorrect
   conversion:
   
   ```
   $ cabal repl lib:dhall
   >>> :set -XDeriveGeneric
   >>> :set -XDeriveAnyClass
   >>> data Amount = Debit Scientific | Credit Scientific deriving (Show, Generic, Inject, Interpret)
   >>> Dhall.Core.pretty (embed inject (Debit 5.45))
   "< Debit = { _1 = 5.45 } >"
   ```
   
   ... which is missing the `Credit` alternative.
   
   After this change you get the correct result:
   
   ```
   < Debit = { _1 = 5.45 } | Credit : { _1 : Double } >
   ```

   

   Gabriella439 committed Apr 1, 2018
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