changed all @returns to @return
	modified:   DbTransactionWrapper.php
	modified:   Singleton/Abstract.php
	modified:   Singleton/Cached.php
	modified:   Singleton/Registry.php
	modified:   Singleton/Stack.php
	modified:   Typed.php
	modified:   UDate.php
	modified:   UDateTime.php
	modified:   UStack.php