`rg` for Mavericks

ripgrep for Mac OS X 10.9 Mavericks.

Shell completions

Add to your shell startup file:

~/.bash_profile: . /usr/local/mavergreen/rg/share/bash-completion/completions/rg
~/.zshrc: fpath=(/usr/local/mavergreen/rg/share/zsh/site-functions $fpath), then, unless your ~/.zshrc already runs it, autoload -U compinit && compinit
~/.config/fish/config.fish: set -p fish_complete_path /usr/local/mavergreen/rg/share/fish/vendor_completions.d