title: RStudio opens documentation in web browser
body: <p>When I type in the name of the function the help box in RStudio I get the answer opened in the web browser instead of RStudio-help window. The same happens when typing in <code>?function</code> for example <code>?which</code>. While doing so I also get the following error in the console:</p>
  
  <pre><code>&gt; ?which
  Error in (function ()  : attempt to apply non-function
  Error in (function ()  : attempt to apply non-function
  Error in (function ()  : attempt to apply non-function
  </code></pre>
  
  <p>This happened after upgrading R to version 3.1.3 and I'm on Ubuntu 14.04.</p>
  
  <p>Does anyone know how to fix this - how to make RStudio open the documentation in RStudio window, not in the web browser?</p>