feat: Events / audit log (#1008)

* feat: Record events in DB

* feat: events API

* First pass, hacky activity feed

* WIP

* Reset dashboard

* feat: audit log UI
feat: store ip address

* chore: Document events.list api

* fix: command specs

* await event create

* fix: backlinks service

* tidy

* fix: Hide audit log menu item if not admin

server/api/__snapshots__/events.test.js.snap

@@ -0,0 +1,10 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`#events.list should require authentication 1`] = `
+Object {
+  "error": "authentication_required",
+  "message": "Authentication required",
+  "ok": false,
+  "status": 401,
+}
+`;