TODO

::::: MISSING TESTS ::

* [FEATURE]: Mount only specified/allowed models/types:
      - Example:
          app.use(API(Post, Article)
          app.use(API(Post, Article, {route: '/api'}))
          app.use(API(Post, Article, {route: '/api', methods: ['get']}))
          app.use(API(Post, Article, {methods: ['get']}))
          app.use(API({route: '/api'}))
          app.use(API({route: '/api', methods: ['get']}))
          app.use(API({methods: ['get']}))

      * Tests for both mounting classes and routes.


::::: CURRENT/NEXT ::

- [FEATURE]: Write middleware env variable so that other middlewares can use these parsed parameters to modify the response to custom format.
      - Example:
          app
            .use(function(req, res, next) {
              if (res.api) {
                res.setHeader('X-Document-Args', [res.api.args.type, res.api.args.id].join('/')); // dumb example
              }
            })
            .use(API())


::::: HIGH ::

- [FEATURE]: List records by type - requires `node-document`/`node-document-storage` support for this.
      - Example:
          GET /posts

- [FEATURE]: List - requires `node-document`/`node-document-storage` support for this.
      - Example:
          GET /_types

- [FEATURE]: Ability to mount GUI on top of the API (which itself talks to the API via AJAX) - requires `node-document-gui` implementation and integration.
      - Example:
          GET /post/new
          GET /post/1/edit
          GET /post/1,2,3/edit


::::: LOW ::

- [FEATURE]: Mount an instance?
      - Example:
          API(Document('Site').get(1), {route: /site})
          GET /site