* Adding /usr/local/bin to path in `~/.zshenv` causes it to be in my path twice one right after the other. /usr/local/bin is already added to the path in the correct order on OSX Yosemite by the /etc/paths file.
* Remove /usr/local/bin from path export in zshenv
From the [Zsh manual](http://zsh.sourceforge.net/Intro/intro_3.html):
> '.zshenv' is sourced on all invocations of the shell, unless the -f option is
> set. It should contain commands to set the command search path, plus other
> important environment variables. `.zshenv' should not contain commands that
> produce output or assume the shell is attached to a tty.
Why is this important? [Alfred](http://www.alfredapp.com/) workflows run in
non-interactive shells. When the `$PATH` is set, or `rbenv` is initialized, in
`zshrc` instead of `zshenv`, those workflows will not use the correct Ruby
version and might not have access to certain bin files, such as those from
`$HOME/.bin/` or Homebrew.
