compatibility layer for aeson; profiling libraries

 Compatibility layer for aeson
  * decode etc. work as in aeson >=0.9
  * but it is generalised to work in any MonadThrow (that is extra)
  * .:? works as in aeson ||=0.11
  * .:! works as in aeson ||=0.11 and as .:? did in aeson ==0.10.*
  * Orphan instances FromJSON Day and FromJSON LocalTime for aeson <0.10
  * Encoding related functionality is not added. It's present only with aeson >=0.10
 .
 This package provides a library for the Haskell programming language, compiled
 for profiling. See http://www.haskell.org/ for more information on Haskell.