ENH: Set up ember-simple-auth (initial) (#12)

Fixes #6

app/authorizers/application.js

@@ -0,0 +1,13 @@
+import Ember from 'ember';
+import BaseAuthorizer from 'ember-simple-auth/authorizers/base';
+
+const { isEmpty } = Ember;
+
+export default BaseAuthorizer.extend({
+  authorize(data, block) {
+    const accessToken = data['token'];
+    if (!isEmpty(accessToken)) {
+      block('Authorization', `Token ${accessToken}`);
+    }
+  }
+});