IP Blacklist

Obviously this could be implemented in the client-side on a per-project basis, but I think it would be a decent idea to implement some sort of IP blacklisting system so that stats don't get bloated during development/QA.

Maybe something along the lines of providing a `.ipignore` file that follows the same general rules of `.gitignore` files?

```
127.0.0.1
192.102.*
*.512.*
```

Again, not sure if you're trying to keep this as micro as possible leaving things like this up to the individual developer. But seems like a feature that many could benefit from.

该 issue 未指定文件、测试或入口点。首先明确过滤应属于 client 还是 analytics service，并定义 .ipignore 的匹配规则；完成的标准是实现范围已达成一致，并且测试覆盖所列出的 IP 模式。

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