uninstall macports, hello homebrew

参考 http://d.hatena.ne.jp/hidde/20090914/1252944208

chpass -s /bin/bash

# exit / reopen shell

sudo port unload apache2 mysql5 mysql5-server
sudo port deactivate active
sudo port -f uninstall installed
sudo port clean all
sudo rm -rf /opt/local
sudo rm -rf /Library/Tcl/macports1.0

ruby -e "$(curl -fsSL https://gist.github.com/raw/323731/install_homebrew.rb)"
brew install git
brew upgrade