Install Ruby on Rails and Gems
Check new version in http://ftp.ruby-lang.org/pub/ruby
Help and documentation for the Ruby programming language.
http://ruby-doc.org/downloads/
Gems can be used to extend or modify functionality in Ruby applications.
http://guides.rubygems.org/
We will be setting up a Ruby on Rails development environment on Mac OS
Installing Homebrew >> ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Website > http://brew.sh/
How to upgrade/downgrade Rubygems
http://rubygems.rubyforge.org/rubygems-update/UPGRADING_rdoc.html