Setup RVM + Ruby + Rails + Gemset

Setup rvm  

1. sudo apt-get install curl git-core
2. copy/paste following lines in terminal
   bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer )
   echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # Load RVM function' >> ~/.bashrc
   source ~/.bashrc
   type rvm | head -1
   rvm requirements
   Install rvm dependencies
   rvm list known

Install Ruby 

1. ​rvm install 1.8.7
2. rvm use 1.8.7 #Set 1.8.7 
3. ruby -v #Check ruby version

Setup gemset 

1. ​rvm gemset create project_name
2. rvm 1.8.7@project_name
3. gem install rails

Setup gemset for your project

1. Go to your project directory
2. rvm --rvmrc --create 1.8.7@project_name