Don't export oh-my-zsh configuration paramaters to the environment

These variables are only used by oh-my-zsh, so there's no need
to populate the environment of all children with them.

templates/zshrc.zsh-template

 # Path to your oh-my-zsh configuration.
-export ZSH=$HOME/.oh-my-zsh
+ZSH=$HOME/.oh-my-zsh
 
 # Set to the name theme to load.
 # Look in ~/.oh-my-zsh/themes/
-export ZSH_THEME="robbyrussell"
+ZSH_THEME="robbyrussell"
 
 # Set to this to use case-sensitive completion
-# export CASE_SENSITIVE="true"
+# CASE_SENSITIVE="true"
 
 # Comment this out to disable weekly auto-update checks
-# export DISABLE_AUTO_UPDATE="true"
+# DISABLE_AUTO_UPDATE="true"
 
 # Uncomment following line if you want to disable colors in ls
-# export DISABLE_LS_COLORS="true"
+# DISABLE_LS_COLORS="true"
 
 # Which plugins would you like to load? (plugins can be found in ~/.oh-my-zsh/plugins/*)
 # Example format: plugins=(rails git textmate ruby lighthouse)