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"
I'm not sure I follow, which of these are you suggesting?

```json
{
    "_links": {
        "self": {
            "href": "..."
        },
        "profile": {
            "href": "...",
            "enctype": "application/alps+xml"
        }
    }
}
```

```json
{
    "_links": {
        "self": {
            "href": ".../coffeebucks/"
        },
        "profile": {
            "href": ".../coffeebucks/",
            "enctype": "application/alps+xml"
        }
    }
}
```

Or neither?

Also, we could just make all the URL's relative instead of having "...", but I wanted to present it in a way that is visually concrete, and "www.example.com" is a convention in documents.