Add Stage Constants.

Mage/Task/AbstractTask.php

@@ -25,6 +25,30 @@ use Exception;
  */
 abstract class AbstractTask
 {
+	/**
+	 * Stage Constant for Pre Deployment
+	 * @var string
+	 */
+	const STAGE_PRE_DEPLOY = 'pre-deploy';
+
+	/**
+	 * Stage Constant for Deployment
+	 * @var string
+	 */
+	const STAGE_DEPLOY = 'deploy';
+
+	/**
+	 * Stage Constant for Post Deployment
+	 * @var string
+	 */
+	const STAGE_POST_DEPLOY = 'post-deploy';
+
+	/**
+	 * Stage Constant for Post Release
+	 * @var string
+	 */
+	const STAGE_POST_RELEASE = 'post-release';
+
 	/**
 	 * Configuration
 	 * @var Config;