brew update
rvm get stable
rvm requirements
rvm install 2.0.0
rvm use --default 2.0.0
rvm gemset create piron
rvm gemset use piron
gem install rails
brew update
rvm get stable
rvm requirements
rvm install 2.0.0
rvm use --default 2.0.0
rvm gemset create piron
rvm gemset use piron
gem install rails