title: When creating a composer package, what "Package Type" should I choose
body: <p>I'm creating my first PHP Composer package (following <a href="http://blog.jgrossi.com/2013/creating-your-first-composer-packagist-package/" rel="noreferrer">these instructions</a>).
  I've run </p>
  
  <pre><code>$ composer init
  </code></pre>
  
  <p>and am filling in the details, it is now asking me for </p>
  
  <blockquote>
    <p>Package Type (e.g. library, project, metapackage, composer-plugin) []:</p>
  </blockquote>
  
  <p>I assume this is just a human-decipherable label for categorising the different packages?</p>
  
  <p>I wondered if there is a definition of package types somewhere?</p>