How to turn off doze mode for specific apps in Android Marshmallow

New in Android Marshmallow is a feature called "Doze mode," which prevents certain tasks from running if you're phone's been sitting idle for a while. The idea here is to save battery life by reducing power draw while you aren't using your phone. But if you have a particular app that you want to leave running unchecked, no matter what, you can disable Doze mode for that app. Here's how to do it. Open the Settings app and tap Battery. Tap the Options menu button (the three dots in the upper right...