You can now have different columns per directory. So now, the Git column only appears when there's a Git repository in the current directory.

- Rename std::io to std::old_io

This is something that I've long wanted to add. It uses libgit2 as an optional dependency.

- uint -> usize
- getopts Cargo library
- replace feature gates with unstable APIs

Also, remove dependency on the Regex library by replacing the one place it was used with standard code that should hopefully be faster anyway.

Now the grids are optimised so each column is only as wide as its longest file name. The method could do with some optimising, but at least it works.

- Prefer iter over into_iter where appropriate
- Cut down on cloning

I'm serious, the more functionality I can use external crates for, the better.

Feels good turning all that code into a dependency!

I can't complain, because the breaking changes were caused by my pull request...

With suggestions from helpful #rust folk. Thank you!

Yeah, I broke my own code again.

Also, re-use the stat result from directory-checking.

This finally fixes the issue where trying to list a file causes a crash. Also, tidy up some of the uses of references.

What a strange bug to happen

The language keeps changing when I'm not looking!

Also, rename old 'lines' view to 'details' which makes more sense

- Lifetime changes in unix.rs
- lexical_ordering -> cmp
- from_utf8_lossy got moved into String
- vec.get(n) -> vec[n]