cindex ignores IRC log files

```
https://code.google.com/p/codesearch/source/browse/cmd/cindex/cindex.go#132 has
the relevant line of code. Effectively when I run cindex on my IRC log
directory, I get an index of *only* the private conversations. Public
conversations are in files named after the channel, so for example:
`2014/#ubuntu.03.log`.

cindex decides to ignore dotfiles, tildefiles, and for some reason probably
relating to EMACS, files beginning with an octothorpe ('#'). There does not
seem to be any command-line switch to disable this file-skipping (-a would seem
appropriate), and no way to provide custom include/exclude rules.

Since searching IRC logs is probably more common for me than searching code, it
makes this amazing tool rather less useful for me!

```

Original issue reported on code.google.com by `geope...@gmail.com` on 27 Mar 2014 at 5:03

Inizia da cmd/cindex/cindex.go alla riga indicata nell’issue e verifica come vengono ignorati i dotfiles, i tildefiles e i file che iniziano con '#'. Esegui cindex su una directory contenente file IRC come 2014/#ubuntu.03.log; il lavoro è completato quando i log dei canali pubblici vengono indicizzati oppure il comportamento di inclusione richiesto è disponibile senza interrompere le esclusioni esistenti.

Scritto dal modello di indicizzazione a partire dal testo della issue.