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.

La issue non indica file, test o punti di ingresso. Chiarisci innanzitutto se il filtraggio debba appartenere al client o al servizio analytics e definisci le regole di corrispondenza di .ipignore; il lavoro è completo quando l’ambito dell’implementazione è concordato e i test coprono i pattern IP elencati.

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