Edit collection (#173)

* Collection edit modal

* Add icon

* 💚

* Oh look, some specs

* Delete collection

* Remove from collection

* Handle error responses
Protect against deleting last collection

* Fix key

* 💚

* Keyboard navigate documents list

* Add missing database constraints

server/api/documents.test.js

@@ -1,3 +1,4 @@
+/* eslint-disable flowtype/require-valid-file-annotation */
 import TestServer from 'fetch-test-server';
 import app from '..';
 import { View, Star } from '../models';