refactor: more oop with stores (#2216)

* refactor: more oop with stores

* forgot bulk delete

* Revert "forgot bulk delete"

This reverts commit 1b4fb999ee07b358ee6e1af9efb8981b84f83af1.

* appease linter

* missed some


shh

* fail

src/stores/UserStore.js

@@ -54,7 +54,7 @@ class UserStore extends DataStore {
     const existing = this.get(id);
     if (existing) return Promise.resolve(existing);
 
-    return this.client.api.users(id).get().then(data => this.create(data, cache));
+    return this.client.api.users(id).get().then(data => this.add(data, cache));
   }
 }