Homebrew/homebrew — pull request #30669 by yyuu (2014-07-05 08:32:06+00:00)
Title: pyenv-virtualenv 20140705

Changes:

* Display information on auto-(de)?activation
* Support manual (de)?activation with auto-activation enabled
* Exit as error when (de)?activation failed
* Use https://bootstrap.pypa.io/ to install setuptools and pip
* Create backup of original virtualenv within `$(pyenv root)/versions` when `--upgrade`