Fix str::from_utf8(...).unwrap()

[stanislav-tkach]

See #295 for details.

[martintc]

Oh okay, was under the assumption that if an error occured, it would hit _ =>. So, since from_utf8 returns a result, can we cast aside the unwrap() and instead do something like:

 match str::from_utf8(&os.stdout) {
        Ok("FreeBSD\n") => { // some code},
        Err(_) => Type::FreeBSD
}

[martintc]

Ill get the implemented in code. I also noticed I can probably call trim() and remove the new line escape characters in the string literals, making the code look a little cleaner.

[stanislav-tkach]

Closed with #303.