The default is to add a widget to your home screen every time you install an app. Setting is not where I expected it to be. Settings/Data Usage then click on Google Play Store. Click View App Settings at the bottom (may have to scroll down) and you will see the attached screen.
It's not that way on mine... I've never allowed or messed with my settings on Google Play Store, or the previous version, but always had to manually download all my updates.