title: Installing symfony2 cmf composer issues
body: <p>Pretty new to Symfony, I want to get the CMF to work but I'm having issues installing it using composer</p>
  
  <p>When running the code in terminal I get this</p>
  
  <blockquote>
    <p>Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. Run update to update them.
    Your requirements could not be resolved to an installable set of packages.</p>
    
    <p>Problem 1<br>
        - Installation request for symfony/icu 1.2.x-dev -> satisfiable by symfony/icu[1.2.x-dev].<br>
        - symfony/icu 1.2.x-dev requires lib-icu >=4.4 -> the requested linked library icu has the wrong version installed or is missing from
    your system, make sure to have the extension providing it.   </p>
    
    <p>Problem 2<br>
         - symfony/icu 1.2.x-dev requires lib-icu >=4.4 -> the requested linked library icu has the wrong version installed or is missing from
     your system, make sure to have the extension providing it.<br>
         - symfony/symfony 2.3.x-dev requires symfony/icu ~1.0 -> satisfiable by symfony/icu[1.2.x-dev].
         - Installation request for symfony/symfony 2.3.x-dev -> satisfiable by symfony/symfony[2.3.x-dev].</p>
  </blockquote>
  
  <p>As requested my composer.json looks like this...</p>
  
  <pre><code>{
      "name": "symfony/framework-standard-edition",
      "license": "MIT",
      "type": "project",
      "description": "The \"Symfony Standard Edition\" distribution",
      "autoload": {
          "psr-0": { "": "src/" }
      },
      "require": {
          "php": "&gt;=5.3.3",
          "symfony/symfony": "2.3.*",
          "doctrine/orm": "&gt;=2.2.3,&lt;2.4-dev",
          "doctrine/doctrine-bundle": "1.2.*",
          "twig/extensions": "1.0.*",
          "symfony/assetic-bundle": "2.3.*",
          "symfony/swiftmailer-bundle": "2.3.*",
          "symfony/monolog-bundle": "2.3.*",
          "sensio/distribution-bundle": "2.3.*",
          "sensio/framework-extra-bundle": "2.3.*",
          "sensio/generator-bundle": "2.3.*",
          "incenteev/composer-parameter-handler": "~2.0",
          "knplabs/knp-paginator-bundle": "2.3.*@dev"    },
      "scripts": {
          "post-install-cmd": [
              "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
          ],
          "post-update-cmd": [
              "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
              "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
          ]
      },
      "config": {
          "bin-dir": "bin"
      },
      "minimum-stability": "stable",
      "extra": {
          "symfony-app-dir": "app",
          "symfony-web-dir": "web",
          "incenteev-parameters": {
              "file": "app/config/parameters.yml"
          },
          "branch-alias": {
              "dev-master": "2.3-dev"
          }
      }
  }
  </code></pre>
  
  <p>I have run</p>
  
  <pre><code>composer.phar update
  </code></pre>
  
  <p>And get no errors but the other problems are a bit of a mystery to me</p>
  
  <p>Any help would be appreciated...</p>