oh-my-zsh custom plugin for faster navigation

Created by Justin Chang

Clone this repository into oh-my-zsh's plugin folder (~/.oh-my-zsh/plugins/ by default).

• visit FOO: Change directory to FOO and mark current directory as the origin.
• back: If not in origin directory, navigate to origin. If in origin directory, navigate to last location this command was invoked from.
• origin: List origin and visit locations.