title: Install component zf2 using composer
body: <p>I try to install zf2 component using composer but can't do it because composer always
  download all framework, what am i doing wrong?</p>
  
  <p><em>Composer version 1beccf9</em></p>
  
  <pre><code>{
   ...
  "repositories": [
   {
     "type": "composer",
     "url": "http://packages.zendframework.com/"
   }
   ],
  "require": {
    "zendframework/zend-http" : "2.0.*"
   }
  }
  </code></pre>