Add oh-my-zsh as a git submodule

.gitmodules

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+[submodule ".oh-my-zsh"]
+	path = .oh-my-zsh
+	url = https://github.com/robbyrussell/oh-my-zsh.git

.oh-my-zsh

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+Subproject commit b6ea876971b2270a2c73a07a6f6a337604132c6f

.zshrc

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+# Path to your oh-my-zsh configuration.
+ZSH=$HOME/.oh-my-zsh
+
+# Set name of the theme to load.
+# Look in ~/.oh-my-zsh/themes/
+# Optionally, if you set this to "random", it'll load a random theme each
+# time that oh-my-zsh is loaded.
+ZSH_THEME="robbyrussell"
+
+# Example aliases
+# alias zshconfig="mate ~/.zshrc"
+# alias ohmyzsh="mate ~/.oh-my-zsh"
+
+# Set to this to use case-sensitive completion
+# CASE_SENSITIVE="true"
+
+# Comment this out to disable bi-weekly auto-update checks
+# DISABLE_AUTO_UPDATE="true"
+
+# Uncomment to change how often before auto-updates occur? (in days)
+# export UPDATE_ZSH_DAYS=13
+
+# Uncomment following line if you want to disable colors in ls
+# DISABLE_LS_COLORS="true"
+
+# Uncomment following line if you want to disable autosetting terminal title.
+# DISABLE_AUTO_TITLE="true"
+
+# Uncomment following line if you want to disable command autocorrection
+# DISABLE_CORRECTION="true"
+
+# Uncomment following line if you want red dots to be displayed while waiting for completion
+# COMPLETION_WAITING_DOTS="true"
+
+# Uncomment following line if you want to disable marking untracked files under
+# VCS as dirty. This makes repository status check for large repositories much,
+# much faster.
+# DISABLE_UNTRACKED_FILES_DIRTY="true"
+
+# Which plugins would you like to load? (plugins can be found in ~/.oh-my-zsh/plugins/*)
+# Custom plugins may be added to ~/.oh-my-zsh/custom/plugins/
+# Example format: plugins=(rails git textmate ruby lighthouse)
+plugins=(git)
+
+source $ZSH/oh-my-zsh.sh
+
+# Customize to your needs...