title: Can't uninstall Rails gem
body: <p>I was updating  <code>rails</code> version when I noticed that uninstalling <code>rails</code> still give you access to it (you can call <code>$ rails new name</code>). I used the following commands in terminal, (I am on OS X using <code>rvm</code>):</p>
  <pre><code> ~  rvm list
  
  rvm rubies
  
  =&gt; ruby-2.0.0-p594 [ x86_64 ]
     ruby-2.1.3 [ x86_64 ]
   * ruby-2.2.0 [ x86_64 ]
  
  # =&gt; - current
  # =* - current &amp;&amp; default
  #  * - default
  
   ~  rails -v
  Rails 4.2.0
   ~  gem uninstall rails
   ~  gem list G rails
  capistrano-rails (1.1.0)
  coffee-rails (4.0.1)
  factory_girl_rails (4.3.0)
  font-awesome-rails (4.0.3.1)
  jquery-rails (3.0.4)
  jquery-ui-rails (4.1.1)
  rails-deprecated_sanitizer (1.0.3)
  rails-dom-testing (1.0.5)
  rails-html-sanitizer (1.0.1)
  rails-observers (0.1.2)
  rails_admin (0.6.0)
  rspec-rails (2.14.1)
  sass-rails (4.0.1)
  sprockets-rails (2.0.1)
   ~  rails -v
  Rails 4.2.0 
  </code></pre>
  <p>As you can see, after uninstalling rails, I still have access to it. G  in <code>gem list G rails</code> is an alias for <code>|GREP</code>.</p>
  <p>How to get rid of Rails?</p>