title: shiny example apps not running
body: <p>I just installed shiny in RStudio and tried to run the example apps with runExample()
  e.g. runExample("01_hello") but all I get as output is just the title, some input box and then the script code of the app.r, no plot though. In the console just a bunch of error messages:
  Warning: Error in .Call: "_httpuv_decodeURIComponent" not available for .Call() for package "httpuv"
  Stack trace (innermost first):
      1: runApp</p>
  
  <p>Can you see the problem from the picture? 
  Thanks a lot.</p>