= httpx: DRY up *JsonSupportSpec
= httpx: test and unify error behavior in *JsonSupport classes, fixes #742
! httpx: DRY up Json4s(Jackson)Support, which is not strictly source compatible but should be binary compatible
Merge pull request #792 from jrudolph/i/742-better-exceptions-with-Json4s

I/742 better exceptions with json4s