square/maximum-awesome — pull request #147 by kengeorge (2014-03-31 05:16:01+00:00)
Title: Fixed issue with --version check on uninstalled packages.

brew —version returns no values and causes no errors on missing
packages, leading to NPEs on brew_tmux_query.split.
Moved the tmux checking logic out of the generic install method and
into the tmux step for clarity and to avoid errors.