Add support for url encoded bodies

[matryer]

This:

name=Tyler&city=SLC

Should become an object like this:

{
  name: "Tyler",
  city: "SLC"
}

[tylerstillwater]

So, basically, URLEncoded->JSON? When would this be used?

[matryer]

HTML forms post data in URL encoded format (i.e. name=Tyler&city=SLC). It would be good if we added a codec to support this type too. Mime type would be application/x-www-form-urlencoded

[tylerstillwater]

Simple enough. Let's do it.