Add some convenience methods to go from CStr -> str

A common problem when working with FFI right now is converting from raw
C strings into `&str` or `String`. Right now you're required to say
something like

    let cstr = unsafe { CStr::from_ptr(ptr) };
    let result = str::from_utf8(cstr.to_bytes());

This is slightly awkward, and is not particularly intuitive for people
who haven't used the ffi module before. We can do a bit better by
providing some convenience methods on CStr:

    fn to_str(&self) -> Result<&str, str::Utf8Error>
    fn to_string_lossy(&self) -> Cow<str>

This will make it immediately apparent to new users of CStr how to get a
string from a raw C string, so they can say:

    let s = unsafe { CStr::from_ptr(ptr).to_string_lossy() };

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