Add homesick castle scaffolding
Add thoughtbot laptop local config

- homesick install
- prepare for oh-my-zsh
- dotfiles install
Symlink dotfiles. Install oh-my-zsh.
Remove private .zsh config
Add zsh config, preserving original .zshrc
Run oh-my-zsh install in zsh
Remove oh-my-zsh. Add antigen.
Pull or clone antigen for idempotence
Tweak homesick bootstrap for idempotence
Add oh-my-zsh plugins. Specify zsh prompt.
Fix oh-my-zsh plugin references
Fix prompt references to git command
Delete much that is old. Update readme.
Add license
Finish removing old stuff
Update readme with thoughtbot vagrant instructions
Clean up readme
Fix RPROMPT
Fix option-arrow backword/forward key bindings