Prep for beta12.

Alias qd to cutie because homonyms.

Prep for 7.0.0

Prep for 7.0.0-rc2.

Prep for 7.0.0-rc1.

Prep for 6.6.0.

Prep for 7.0.0-alpha9.

Merge pull request drush-ops#1097 from colans/zsh-autocompletion

Explain how to set up ZSH autocompletion in the docs

Prep for alpha7.

Prep for drush_version=7.0.0-alpha6