PBS Kids has automated testing that looks for uses-sdk with a minimum targetSDK of 23. Even though this gets overridden in the build.gradle settings, adding a line with default values to get through their testing.
Changed android:requiresSmallestWidthDp from 600 to 500.
Android suggests that 600 is a normal value for 7 inch tablets and up. It turns out that many 7-inch tablets are in the 500-600 range (half of the Amazon ones for example).
Fixes#85