参考リンク
Rails 3 - can't install pg gem
http://stackoverflow.com/questions/9668753/rails-3-cant-install-pg-gem
HOWTO: Wrangle the pg (postgresql) gem with macports and rvm
http://matthew.mceachen.us/blog/howto-wrangle-the-pg-postgresql-gem-with-macports-and-rvm-1159.html
MacPorts Portfiles(PostgreSQL)
http://www.macports.org/ports.php?by=name&substr=postgresql
Heroko problem / can't install gem pg
http://www.ruby-forum.com/topic/3652830
10/22 Ruby on Railsのセットアップに大ハマリした
http://www.erde.co.jp/blog/?p=505
Getting Started with Rails 3.x on Heroku/Cedar
https://devcenter.heroku.com/articles/rails3
Managing Your SSH Keys
https://devcenter.heroku.com/articles/keys