Apple has released an update to GarageBand for iOS adding the ability to import songs from the iOS Music library and create ringtones directly from the app. With GarageBand 1.3 users on iOS 6 can now create custom ringtones and alerts for the iPhone, iPad or iPod touch and save them directly into the device’s ringtone/alert library. The new version also adds support for importing songs directly from the iOS Music library and playing and…