removed the old json wrapper so that arbitrary json libraries can be plugged into the system.
updated docs to reflect new json api
no need for an additional service layer. just use the implicit
remove unnecessary json converter
removed the JsonResponse type. just use Json directly
missed an instance of JsonResponse in the docs
some style fixes
accidently replaced the wrong example
Merge pull request #78 from rpless/feature/json-abstraction

Pluggable JSON Libraries