change header showcase链接

Author: why520crazy

app/views/home/header.html

@@ -20,7 +20,7 @@
  <li>
  <a href="http://ngnice.com/docs/guide"><i class="fa fa-book"></i> 开发指南</a>
  </li>
- <li class="active"><a target="_blank" href="http://ngnice.com/showcase">展示案例</a>
+ <li class="active"><a href="http://ngnice.com/showcase">展示案例</a>
  </li><li class=""><a href="http://ngnice.com/about">关于</a>
  </li>