made uninstaller and made it ready for managed entities

CRM/Civirules/BAO/Action.php

@@ -72,6 +72,14 @@ class CRM_Civirules_BAO_Action extends CRM_Civirules_DAO_Action {
     if (empty($actionId)) {
       throw new Exception('action id can not be empty when attempting to delete a civirule action');
     }
+
+    if (!CRM_Core_DAO::checkTableExists(self::getTableName())) {
+      return;
+    }
+
+    //delete rows from rule_action to prevent a foreign key constraint error
+    CRM_Core_DAO::executeQuery("DELETE FROM `civirule_rule_action` where `action_id` = %1", array(1 => array($actionId, 'Integer')));
+
     $action = new CRM_Civirules_BAO_Action();
     $action->id = $actionId;
     $action->delete();

CRM/Civirules/BAO/Condition.php

@@ -75,6 +75,14 @@ class CRM_Civirules_BAO_Condition extends CRM_Civirules_DAO_Condition {
     if (empty($conditionId)) {
       throw new Exception('condition id can not be empty when attempting to delete a civirule condition');
     }
+
+    if (!CRM_Core_DAO::checkTableExists(self::getTableName())) {
+      return;
+    }
+
+    //delete rows from rule_condition to prevent a foreign key constraint error
+    CRM_Core_DAO::executeQuery("DELETE FROM `civirule_rule_condition` where `condition_id` = %1", array(1 => array($conditionId, 'Integer')));
+
     $condition = new CRM_Civirules_BAO_Condition();
     $condition->id = $conditionId;
     $condition->delete();

CRM/Civirules/Upgrader.php

@@ -20,4 +20,8 @@ class CRM_Civirules_Upgrader extends CRM_Civirules_Upgrader_Base {
     $this->executeSqlFile('sql/createCiviruleRuleCondition.sql');
     $this->executeSqlFile('sql/createCiviruleRuleLog.sql');
   }
+
+  public function uninstall() {
+    $this->executeSqlFile('sql/uninstall.sql');
+  }
 }
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