title: Doctrine2: How to set all tables to collate with UTF8
body: <p>I am using Doctrine with Symfony2. 
  My config.yml file looks something like this:-</p>
  
  <h1>Doctrine Configuration</h1>
  
  <pre><code>doctrine:
      dbal:
          driver: %database_driver%
          host: %database_host%
          port: %database_port%
          dbname: %database_name%
          user: %database_user%
          password: %database_password%
          charset: UTF8
  </code></pre>
  
  <p>Unfortunately my tables are not collating to the UTF8_general_ci or UTF8_unicode_ci
  I tried </p>
  
  <pre><code>collate: utf8_unicode_ci
  </code></pre>
  
  <p>But Doctrine2 didn't recognize the option. </p>
  
  <p>How can I achieve the same?</p>