Still missing a few Beta features, but it compiles!

- Copy requires Clone
- current_dir returns a Path now
- num_cpus moved to a crate

- Changes to users crate

- old_path::Path isn't imported by default anymore
- range -> ..

This stops the openssl-sys version clash preventing exa from compiling.

This compiles, but with manymany warnings.

- Update package versions
- locale::default -> locale::english
- Argument handling changes

This has been mostly done with changes in the datetime crate's suddenly
supporting locales.

It's still important that the user's locale is touched only once and
cached from that point on, so a struct in output::details has been made
public, along with that module. This will change later as that object
gains more and more uses thoughout the codes.

Use the `locale` crate as a dependency to read in the set
thousands-separator character, and pass this to the file size column,
which uses it to add the separators in.

en_GB uses ","
fr_FR uses "" and just displays the numbers in one go.

This prevents crates.io from doing weird things from a circular depedency, which is probably my fault.

Using the datetime crate, add an extra column to the --long view that
prints out the modified, accessed, or created timestamp for each file.
Also, let the user pick which one they want to see based on the --time
command-line option.

- 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.

std::str changes, and the way macros are expanded.

- 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.