title: stuck at "Getting org.scala-sbt sbt 0.13.6 ..." when running sbt in terminal
body: <p>Similar problem with <a href="https://stackoverflow.com/questions/26582300/how-to-use-sbt-behind-authenticated-proxy">How to use sbt behind authenticated proxy?</a>. I tried with the given answer and problem still there. </p>
  
  <p>When I run <strong>sbt</strong> in terminal, it shows and stucks at : </p>
  
  <pre><code>Getting org.scala-sbt sbt 0.13.6 ...
  </code></pre>
  
  <p>additional information: </p>
  
  <pre><code> sbt --version
   sbt launcher version 0.13.6
  </code></pre>
  
  <p>How could I fix it?</p>