title: Install multiple version of PHPUnit via composer
body: <p>I am working with <code>ZendFramework 1.x &amp; 2.x</code>, unfortunately <code>ZendFramework 1.x</code> supports only <code>PHPUnit 3.x</code> &amp; <code>Zend Framework 2.x</code> requires <code>PHPUnit 4.x</code></p>
  
  <p>For this i want to install 2 versions of PHPUnit, here is the composer.json file i tried.</p>
  
  <pre><code>{
      "repositories": [{
          "type": "pear",
          "url": "http://pear.symfony-project.com"
      },{
          "type": "pear",
          "url": "http://pear.phpunit.de"
      }],
      "require-dev": {
          "pear-pear.phpunit.de/PHPUnit": "3.4.*",
          "phpunit/phpunit": "*"
      }
  }
  </code></pre>
  
  <p>I am getting following message.</p>
  
  <blockquote>
    <p>Skipped installation of bin phpunit for package phpunit/phpunit: name
    conflicts with an existing file</p>
  </blockquote>
  
  <p>Is there anyway that i can tell composer to use different names when installing in <code>vendor/bin</code> directory? for instance <code>"pear-pear.phpunit.de/PHPUnit": "3.4.*"</code> uses <code>vendor/bin/pu34</code> &amp; <code>"phpunit/phpunit": "*"</code> uses <code>vendor/bin/pu</code></p>
  
  <p>is it possible to do this in composer?</p>