Added Hale tutorial, updated README

Summary of Changes:
Added a Tutorial

Cleaned json in spec
Rewrote section on render
Now supports "enctype" and "request_encoding" as two separate fields
Changed "enctype" default
Cleaned up text for "options"
So, one of the things I think we should consider in this document is more often than not use "href": "..." to emphasize the opacity of the URIs vs propagating misunderstandings that more is being said or implied by these examples than is. Make sense? Thoughts?