Add zsh related dotfiles and update vimrc

README.md

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+# Erik Cowley's dot files
+
+Includes my customization related to:
+ * zsh - show Python virtual env info in prompt
+ * vim - lots of plugins and custom shortcuts
+ * ctags
+
+Recommended workflow:
+ 1. Install oh-my-zsh
+ 2. Copy cowley.zsh to ~/.oh-my-zsh/custom/
+ 3. Copy cowley.zsh-theme to ~/.oh-my-zsh/custom/themes/
+ 4. Copy .zshrc to your home directory
+ 5. Install vim's Vundle plugin
+ 6. Copy .vimrc to your home directory
+ 7. Open vim and run :VundleUpdate to install plugins
+ 8. Rename vim.py to vim and place it in your path in a higher precedence than
+    the vim executable
+