fix links

Author: afshinm

index.html

@@ -59,9 +59,9 @@
 
       <div class="masthead">
         <ul class="nav nav-pills pull-right" data-step="5" data-intro="Get it, use it.">
-          <li><a href="https://github.com/usablica/intro.js"><i class='icon-black icon-download-alt'></i> Download</a></li>
-          <li><a href="https://github.com/usablica/intro.js">Github</a></li>
-          <li><a href="https://twitter.com/usablica">@usablica</a></li>
+          <li><a href="https://github.com/usablica/intro.js/tags" target="_blank"><i class='icon-black icon-download-alt'></i> Download</a></li>
+          <li><a href="https://github.com/usablica/intro.js" target="_blank">Github</a></li>
+          <li><a href="https://twitter.com/usablica" target="_blank">@usablica</a></li>
         </ul>
         <h3 class="muted">Intro.js</h3>
       </div>