instalar rvm ( http://rvm.io )
atualização rvm
rvm get stable- instalar o pacote openssl / readline
rvm pkg install openssl
rvm pkg install readline- instalar ruby 2.0.0
rvm install 2.0.0 --with-openssl-dir=$rvm_path/usr --with-readline-dir=$rvm_path/usr- definir a versão ruby padrão
rvm use 2.0.0 --default