robbyrussell/oh-my-zsh — pull request #1458 by ranman (2012-12-02 21:56:53+00:00)
Title: lazyload virtualenvwrapper

Using lazy loading for virtualenvwrapper gives a mariginal speed
improvement and doesn't stop workon_cd from working. It has the
undesired effect of forcing you to call certain virtualenv commands
twice before they work (only once per shell instantiation).