initial installation instructions

When setting up a new mac:

• install xcode via app store
• install homebrew - see website

brew cask install atom \
  firefox \
  google-chrome \
  spectacle \
  virtualbox \
  vagrant

• install deps via brew

brew install bash \
  byobu \
  git \
  coreutils \
  findutils \
  node \
  python \
  zsh

• install virtualenvwrapper

python -m pip install virtualenvwrapper

• install oh-my-zsh

sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

• python bootstrap.py

• pick your theme from https://github.com/robbyrussell/oh-my-zsh/wiki/Themes and add it to your .zshrc.

• source ~/.osx to update OSX settings to be more developer friendly