Add optional parameters for symfony2/cache-clear

Add optional parameters for symfony2/cache-clear task like --no-warmup.

Mage/Task/BuiltIn/Symfony2/CacheClearTask.php

@@ -15,7 +15,12 @@ use Mage\Task\BuiltIn\Symfony2\SymfonyAbstractTask;
 /**
  * Task for Clearing the Cache
  * 
+ * Example of usage:
+ *    symfony2/cache-clear: { env: dev }
+ *    symfony2/cache-clear: { env: dev, optional: --no-warmup }
+ *
  * @author Andrés Montañez <andres@andresmontanez.com>
+ * @author Samuel Chiriluta <samuel4x4@gmail.com>
  */
 class CacheClearTask extends SymfonyAbstractTask
 {
@@ -36,8 +41,10 @@ class CacheClearTask extends SymfonyAbstractTask
     {
         // Options
         $env = $this->getParameter('env', 'dev');
+        $optional = $this->getParameter('optional', '');
+
+        $command = $this->getAppPath() . ' cache:clear --env=' . $env . ' ' . $optional;
 
-        $command = $this->getAppPath() . ' cache:clear --env=' . $env;
         $result = $this->runCommand($command);
 
         return $result;