title: Pik Install Ruby Yields: Error: Private method 'gsub' called for nil:NilClass
body: <p>I just installed pik, and when trying:</p>
  
  <pre><code> pik install ruby 1.9.3-p193
  </code></pre>
  
  <p>I received the error:</p>
  
  <pre><code>There was an error.
   Error: private method 'gsub' called for nil:NilClass
  
  in: pik/commands/install_command.rb:24:in 'execute'
  in: pik_runner:33
  </code></pre>
  
  <p>Thanks, suggestions?</p>