Add env util
fix option parsing
Merge pull request #5 from KokaKiwi/master

Modified Makefile (see #3)
cleanup alignment inconsistency
Merge pull request #6 from wilmoore/tidy-makefile

Alignment consistency in Makefile
Fix makefile
Merge remote-tracking branch 'LeoTestard/env'
Update readme
Tweaks for consistency with other commands, added support for -u, -V and -h, refs #4
Add env to the build
Update main utils for language changes.
Update cat/test for std::rt::io changes. Also, use the higher level
std::run over std::rt::io::process.
Make tests depend on their corresponding binary.
Merge pull request #7 from huonw/update

Update for Rust changes.
Use new ProcessExit enum
std::rt::io -> std::io