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/models/Revision.js

@@ -1,3 +1,4 @@
+// @flow
 import { DataTypes, sequelize } from '../sequelize';
 
 const Revision = sequelize.define('revision', {