title: Rails rake updating issue - Could not find rake-10.4.2 in any of the sources
body: <p>I'm attempting (without much success) to run <code>rake db:migrate</code> on a rails project, however it returns:</p>
  
  <pre><code>Could not find rake-10.4.2 in any of the sources
  Run bundle install to install missing gems.
  </code></pre>
  
  <p>I ran <code>bundle install</code> and worked fine - installed rake 10.4.2, however when I ran: <code>rake --version</code> (for some reason you can't do rake -v  ???) and it shows: <code>rake, version 0.9.6</code></p>
  
  <p>I ran bundle update rake and returned my list of gems and then: <code>Your bundle is updated!</code></p>
  
  <p>Why isn't rake updating? Is there something I'm doing wrong (I'm new to rails btw - so this is probably really simple)</p>
  
  <p>Any help is really appreciated</p>