return Content Type of application/hal+json instead of just json

[orta therox]

See: http://stateless.co/hal_specification.html

How to serve HAL

HAL has a media type for both the JSON and XML variants, whos names are application/hal+json and application/hal+xml respectively.
When serving HAL over HTTP, the Content-Type of the response should contain the relevant media type name.

We're currently returning application/json. This opens us to be able to use more hypermedia clients! :D 

[orta therox]

Related: I've also had a report that we're handing our accept responses incorrect:

$ curl -H 'Accept: application/hal+json' https://api.artsy.net/api -I
HTTP/1.1 200 OKAY
Content-Type: application/json
```

$ curl -H 'Accept: applicatiomn/vnd.siren+json; application/hal+json' https://api.artsy.net/api -I
HTTP/1.1 400 Bad Request

[Daniel Doubrovkine]

I think you should open those as bugs in Gravity (our internal API project).

[A.]    Daniel Doubrovkine (dB.)
         CTO @ Artsy   

         d...@artsy.net

         @dblockdotorg

         code.dblock.org

--
Find all info about the Artsy.net API at https://developers.artsy.net.
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