install ruby 2.0.0 with rvm

• install rvm (http://rvm.io)

• rvm update

rvm get stable

• install openssl/readline package

rvm pkg install openssl
rvm pkg install readline

• install ruby 2.0.0

rvm install 2.0.0 --with-openssl-dir=$rvm_path/usr --with-readline-dir=$rvm_path/usr

• set default ruby version

rvm use 2.0.0 --default