$ brew upgrade ruby-build
$ rbenv install 2.0.0-p0
$ rbenv global 2.0.0-p0
$ brew install curl-ca-bundle
$ cp /usr/local/Cellar/curl-ca-bundle/1.87/share/ca-bundle.crt /usr/local/etc/openssl/cert.pem
$ gem install bundler rbenv-rehash$ brew upgrade ruby-build
$ rbenv install 2.0.0-p0
$ rbenv global 2.0.0-p0
$ brew install curl-ca-bundle
$ cp /usr/local/Cellar/curl-ca-bundle/1.87/share/ca-bundle.crt /usr/local/etc/openssl/cert.pem
$ gem install bundler rbenv-rehash