title: rubyonrails error when update to gem 1.8.7
body: <p>I am using ruby 1.8.6, and I would like to update. 
  The server company I am with said to run command:</p>
  
  <pre><code>gem update rails
  </code></pre>
  
  <p>ERROR: Error installing rails:</p>
  
  <pre><code>activesupport reqiores Ruby version &gt;= 1.8.7.
  </code></pre>
  
  <p>Also I am working on the company's live site, any help on this matter is appreciated thank you!</p>