Annotation of non API AV content

[azaroth42]

Description

Need to be able to control playback (volume, time, etc) of non AV-API content, such as Youtube.

Proposed Solutions

Add a service block to an AV resource in the Annotation that associates it with the canvas:

{
  "type": "Annotation",
  "target": "http://example.org/canvas/1",
  "body": {
    "id": "http://youtube.com/video",
    "service": {
      "id": "http://youtube.com/video/api",
      "profile": "uri-for-youtube-api",
      "more": ["params", "go","here", "too"]
    }
  }
}

Additional Background

Expands on #2

[azaroth42]

We think this is done, if youtube (etc) are just resources