Revert adding /usr/local/bin to path in zshenv
Revert adding /usr/local/bin to path in zshenv

* 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

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