title: composer update authentication on packagist
body: <p>I have a problem with the composer update for my project made in laravel 5.
  Everytime I want to update the composer with other packages (from Packagist) I get an authentication box (not suposed to be one) and then even if I input my github/packagist account or not I end like this:</p>
  
  <pre><code>Loading composer repositories with package information
  Updating dependencies (including require-dev)
      Authentication required (packagist.org):
        Username:
        Password:
  
  
  
    [Composer\Downloader\TransportException]
    Invalid credentials for 'http://packagist.org/p/doctrine/inflector$caf0d38e
    3001eb2cbabe4192f701affcc10254307a3c01fa6b41a5579b2b648e.json', aborting.
  </code></pre>
  
  <p>I tried until now, to install composer after deleting vendor's folder and composer lock, but again the auth is appearing. 
  I made another laravel project but I start with lot's of vendor folder (like doctrine inflector), and they need auth.
  I also tried a github token, on composer json.</p>
  
  <p>Anyone knows what is the problem?
  Thank you in advance.</p>
  
  <pre><code>D:\Code\pricer&gt;composer diagnose
  Checking composer.json: OK
  Checking platform settings: FAIL
  The xdebug extension is loaded, this can slow down Composer a little.
   Disabling it when using Composer is recommended.
  Checking git settings: OK
  Checking http connectivity: OK
  Checking github.com rate limit: OK
  Checking disk free space: OK
  Checking composer version: OK
  </code></pre>
  
  <p>I don't have problems with the rate limit for an auth and platform settings fail because of xdebug.</p>
  
  <p>And when I am deleting that package and installing composer again</p>
  
  <pre><code>  Problem 1
      - laravel/framework v5.0.14 requires doctrine/inflector ~1.0 -&gt; no matching
  package found.
      - laravel/framework v5.0.14 requires doctrine/inflector ~1.0 -&gt; no matching
  package found.
  </code></pre>
  
  <p>Composer.json:</p>
  
  <pre><code>{
      "name": "laravel/laravel",
      "description": "The Laravel Framework.",
      "keywords": ["framework", "laravel"],
      "license": "MIT",
      "type": "project",
      "require": {
          "laravel/framework": "5.0.*",
          "illuminate/html": "5.0.*@dev",
          "doctrine/dbal": "2.6.*@dev"
      },
      "require-dev": {
          "phpunit/phpunit": "~4.0",
          "phpspec/phpspec": "~2.1"
      },
      "autoload": {
          "classmap": [
              "database"
          ],
          "psr-4": {
              "App\\": "app/"
          }
      },
      "autoload-dev": {
          "classmap": [
              "tests/TestCase.php"
          ]
      },
      "scripts": {
          "post-install-cmd": [
              "php artisan clear-compiled",
              "php artisan optimize"
          ],
          "post-update-cmd": [
              "php artisan clear-compiled",
              "php artisan optimize"
          ],
          "post-create-project-cmd": [
              "php -r \"copy('.env.example', '.env');\"",
              "php artisan key:generate"
          ]
      },
      "config": {
          "preferred-install": "dist"
      }
  }
  </code></pre>