Update README.md
Update README.md
Update README.md
Array intersection working draft
Array union works but need more error traps
Merge branch 'master' of github.com:jpbatz/lunderdash
dev subdir contains files used for intitial testing
added comment to use isArray to verify arguments
Merge branch 'master' of github.com:jpbatz/lunderdash
Finish Array compact and difference functions