fix: examples maintain

[yy1987316]

examples maintain

1. fix example imports
2. start service with using DaemonStart() instead of Start()
3. correct if conditions return in OnMessage handler
4. correct code fragment of replying image
5. add code fragment of replying url link

[CLAassistant]

All committers have signed the CLA.

[huan]

Wechaty Contributors Nomination

Link to wechaty/PMC#16

[yy1987316]

plz let me know if anything blocks this mr from being merged @huan

[dchaofei]

我测试了下你的 pr, 发送图片会失败

[dchaofei]

这是 go-wechaty 的 bug，我已经修复 #106

[dchaofei]

非常感谢你的 pr，我已经 merge

[huan]

Thank you very much for your contribution!

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