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"
Should have a consistent approach to using quotes and back tics. Maybe use " or ' for semantic elements (e.g. 'order_statues) in the examples and ` media type element attributes (e.g. `href`). Regardless, in this sentence you are not consistent given order_status has no quotes and quotes.