osx lion ruby env
https://github.com/kennethreitz/osx-gcc-installer
bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
https://github.com/kennethreitz/osx-gcc-installer
bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)