[FEATURE ember-contextual-components] Add to FEATURES.md

FEATURES.md

@@ -80,3 +80,19 @@ for a detailed explanation.
 * `ember-metal-ember-assign`
 
   Add `Ember.assign` that is polyfill for `Object.assign`.
+
+* `ember-contextual-components`
+
+  Introduce a helper that creates closures over attrs and its own path, then
+  allow the closed over cell to be invoked via the `{{component` helper or
+  any reference with a dot in the path.
+
+  For example:
+
+  ```js
+  {{#with (hash profile=(component "user-profile")) as |userComponents|}}
+    {{userComponents.profile}}
+  {{/with}}
+  ```
+
+  Implements RFC [#64](https://github.com/emberjs/rfcs/blob/master/text/0064-contextual-component-lookup.md)