Suggestion: include zsh completion into distribution package

Expected behavior

zsh completion should work when install Docker for Mac

Actual behavior

Docker for Mac includes only bash completion under /Applications/Docker.app/Contents/Resources/etc, but there are also some other completion are available, like zsh https://github.com/docker/docker/blob/master/contrib/completion/zsh/_docker and others https://github.com/docker/docker/blob/master/contrib/completion/

Information

pinata diagnose -u
OS X: version 10.11.5 (build: 15F34)
Docker.app: version v1.11.1-beta12
Running diagnostic tests:
[OK] Moby booted
[OK] driver.amd64-linux
[OK] vmnetd
[OK] osxfs
[OK] db
[OK] slirp
[OK] menubar
[OK] environment
[OK] Docker
[OK] VT-x
Docker logs are being collected into /tmp/20160520-132025.tar.gz
Most specific failure is: No error was detected
Your unique id is: 41450B75-3BF3-4A95-88CF-F662280127A4
Please quote this in all correspondence.