refactor: Policies Architecture (#1016)

* add policy serialize method

* Add policies to collection responses

* wip

* test: remove .only

* refactor: Return policies with team and document requests

* store policies on the client

* refactor: drive admin UI from policies

app/models/Policy.js

@@ -0,0 +1,11 @@
+// @flow
+import BaseModel from './BaseModel';
+
+class Policy extends BaseModel {
+  id: string;
+  abilities: {
+    [key: string]: boolean,
+  };
+}
+
+export default Policy;