Add JSON parser
Populate params field in Plug.Test.conn/4 when custom params are given.
Merge pull request #105 from koudelka/test-conn-params

Populate params field in Plug.Test.conn/4 when custom params are given.
Use 0.8.0 in README.md

So that Elixir 1.0.0 users have the right version.
Merge pull request #106 from olleolleolle/patch-1

Use 0.8.0 in README.md