Handlers Update

This is a significant and breaking release which paves the way for the version 1.x release in the next few months.

The release includes the addition of a JSON response handler along with breaking changes to filenames so the code language is clearer. For instance, the Auth handler becomes the Html handler because it returns a text/html response, and the JwtAuth factory becomes the JwtMiddleware factory because it returns middleware.

Also significant updates have been made to the README documentation so usage is clearer, along with the addition of some more badges 😉.