Add stub method for reseting sequences.

This method needs to be implemented, but first sequence reflection needs
to be implemented in schema + postgres.

lib/Cake/Database/Connection.php

@@ -413,7 +413,7 @@ public function releaseSavePoint($name) {
 	}
 
 /**
- * Rollsback a save point by its name
+ * Rollback a save point by its name
  *
  * @param string $name
  * @return void
@@ -422,6 +422,19 @@ public function rollbackSavepoint($name) {
 		$this->execute($this->_driver->rollbackSavePointSQL($name));
 	}
 
+/**
+ * Reset a sequence.
+ *
+ * Useful with database platforms that support sequences.
+ *
+ * @param string $table The table to reset.
+ * @param string $key The key to reset.
+ * @return boolean
+ */
+	public function resetSequence($table, $key) {
+		// TODO implement this.
+	}
+
 /**
  * Quotes value to be used safely in database query
  *