Main::PSGI: Implement GET /timelines/TL/unacked_counts.json and GET /updates/unacked_counts.json. Only immediate returns are tested.
t/WebAPI.t: write more tests.
t/WebAPI.t: write weird ID test.
WebAPI.pod, t/WebAPI: write WebAPI Examples. WebAPI.pod is complete.
t/WebAPI: add some characters to the weird ID.