provides a simple implementation of FromStr for Pattern

[blaenk]

Curious what you think. It's not a clear win by any means, but in certain cases it feels more readable to me because it allows the string literal (if that's what we're parsing from) to stand out more.

// with FromStr
"js/**/*.js".parse().unwrap()

// without
Pattern::new("js/**/*.js").unwrap()

The implementation is very simple anyways, as it just delegates to Pattern::new, which I expect will be inlined.

[rust-highfive]

r? @huonw

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[alexcrichton]

Thanks!