Build an RPM package

```
I've added code to build an RPM package for Fedora (and CentOS, RHEL, etc)

It is on this branch: https://github.com/fhuberts/squeezelite/commits/rpm

Maybe consider it for inclusion?
```

Original issue reported on code.google.com by `ferry.hu...@gmail.com` on 8 Feb 2015 at 8:02
