title: How to resolve package not found error when trying to make the composer get the latest package versions?
body: <p>I am using symfony2 with composer. <a href="http://getcomposer.org/doc/04-schema.md" rel="nofollow">http://getcomposer.org/doc/04-schema.md</a></p>
  
  <p>i want that for all the plugins in composer.json , i always get the latest build of the package</p>
  
  <p>I tried this i get error</p>
  
  <pre><code>"php": "&gt;=5.3.3",
          "symfony/symfony": "dev-master",
          "doctrine/orm": "&gt;=2.2.3,&lt;dev-master",
          "doctrine/doctrine-bundle": "dev-master",
          "twig/extensions": "dev-master*",
          "symfony/assetic-bundle": "dev-master",
          "symfony/swiftmailer-bundle": "dev-master",
          "symfony/monolog-bundle": "dev-master",
          "sensio/distribution-bundle": "dev-master",
          "sensio/framework-extra-bundle": "dev-master",
          "sensio/generator-bundle": "dev-master",
          "jms/security-extra-bundle": "dev-master",
          "jms/di-extra-bundle": "dev-master",
          "doctrine/doctrine-migrations-bundle": "dev-master",
          "jms/serializer-bundle": "dev-master",
          "genemu/form-bundle": "dev-master",
          "stof/doctrine-extensions-bundle": "dev-master",
          "friendsofsymfony/user-bundle": "*"
  </code></pre>
  
  <p>The error is</p>
  
  <pre><code>Your requirements could not be resolved to an installable set of packages.
  
    Problem 1
      - The requested package twig/extensions dev-master* could not be found.
  </code></pre>