intall RVM Ruby Version Manager

RVM

1.
bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

2.realod
source ~/.bash_profile

3.
rvm requirements

4.intall
https://github.com/kennethreitz/osx-gcc-installer



5.
rvm install 1.9.3