Use rougify instead of pygmentize
Use --no-document instead of --no-ri and --no-rdoc
Change editor to atom and use new email address
Use export and specify EDITOR, VISUAL and PAGER
Several changes to zsh and oh-my-zsh settings

Disable oh-my-zsh update prompt and add a few oh-my-zsh plugins.
Add zsh syntax highlighting and change color scheme.
Initiat rbenv.
Bump copyright year
Update setup script

pure-prompt is now part of oh-my-zsh, so no reason to install it separatly
anymore. Remove .slate and .zlogin from setup process. Add success message and
exit code.
Remove .zlogin
Add setup instructions