Initial commit (#334).

src/test/resources/org/gitlab4j/api/user-failed-login-system-hook-event.json

+{
+  "event_name": "user_failed_login",
+  "created_at": "2017-10-03T06:08:48Z",
+  "updated_at": "2018-01-15T04:52:06Z",
+        "name": "John Smith",
+       "email": "user4@example.com",
+     "user_id": 26,
+    "username": "user4",
+       "state": "blocked"
+}
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