Add Jawn support for decoding JSON. #68
Fix build and test (application/json takes no charset). #68
Rename ArgonautSupport source file. #68
Upgrade to jawn-streamz-0.3.1-SNAPSHOT.

This moves to something that doesn't require bintray to resolve.
Merge pull request #82 from http4s/topic/json-improvements

Integrate jawn-streamz for decoding JSON.