Fix prompt with newest git-prompt.sh script
Having git-promote exit on error broke things

It would push, but not properly set up the remote, which broke things
like pulling and opening pull requests with gh.

This should be refactored to actually handle errors, then we should
re-add `set -e`.
Add Brewfile, boilerplate

Theoretically, this should install a number of useful brews to my
workflow.

Credit for code to install homebrew goes to @holman
https://github.com/holman/dotfiles/blob/master/homebrew/install.sh

And for having a Brewfile in dotfiles to @gabebw
http://robots.thoughtbot.com/brewfile-a-gemfile-but-for-homebrew
So, I switched to zsh.

These have actually been sitting around in `~` for a while now, so I'm
just getting them added here.
Words that are okay to spell

:help spell