Update default gem version, fix bug on rbenv install
Update default gem version, fix bug on rbenv install

ZeshanNSegal/High_Low,gocodeup/Codeup-Vagrant-Setup,gocodeup/Codeup-Vagrant-Setup,gocodeup/Codeup-Vagrant-Setup,ZeshanNSegal/High_Low,ZeshanNSegal/High_Low,gocodeup/Codeup-Vagrant-Setup,ZeshanNSegal/High_Low