title: Skipped installation of bin/classmap_generator.php ... by update of the Zend Framework 2 library
body: <p>When I try to update ZF2 in my project, I get this warning:</p>
  
  <pre><code># php composer.phar update
  Loading composer repositories with package information
  Updating dependencies (including require-dev)
    - Installing zendframework/zendframework (2.1.5)
      Loading from cache
  
      Skipped installation of bin/classmap_generator.php for package zendframework/zendframework: name conflicts with an existing file
  zendframework/zendframework suggests installing doctrine/common (Doctrine\Common &gt;=2.1 for annotation features)
  zendframework/zendframework suggests installing ext-intl (ext/intl for i18n features)
  zendframework/zendframework suggests installing ircmaxell/random-lib (Fallback random byte generator for Zend\Math\Rand if OpenSSL/Mcrypt extensions are unavailable)
  zendframework/zendframework suggests installing pecl-weakref (Implementation of weak references for Zend\Stdlib\CallbackHandler)
  zendframework/zendframework suggests installing zendframework/zendpdf (ZendPdf for creating PDF representations of barcodes)
  zendframework/zendframework suggests installing zendframework/zendservice-recaptcha (ZendService\ReCaptcha for rendering ReCaptchas in Zend\Captcha and/or Zend\Form)
  Writing lock file
  Generating autoload files
  </code></pre>
  
  <p>What's going wrong here? What is the cause of these conflicts? How to update ZF2 correctly?</p>