Scala 2.11.1, Scalaz 7.1.0-M7
Merge pull request #107 from xuwei-k/scala-2.11

Scala 2.11.1, Scalaz 7.1.0-M7
Allow DecodeJson ||| to combine as supertype.
Merge pull request #110 from tixxit/topic/decodejson-or-supertype

Allow DecodeJson ||| to combine as supertype.