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Jose Narvaez 0ed14bec6d Migrated to redox_users and some refactoring and docs.

Details

- Updated dependencies with `redox_users`.
- Migrated all user/group dependent functionality to calls to `redox_users`.
- Added top level documentation to the crate.
- Added a `spawn_shell` function to reuse a bit of code.
- `login`: Handled the case of an invalid login with "Login incorrect" (as in BSD).
- `passwd`: Refactored a bit and used `eprintln!` where possible.
- `su`: Refactored a bit and used `eprintln!` where possible.
- `sudo`: Refactored a bit to simplify logic also used `eprintln!` where possible.
- `whoami`: Refactored a bit and used `eprintln!/println!` where possible.
- Also added myself on the AUTHORS section :).

2017-11-08 22:49:00 +00:00