Ignore cache data if there are problems reading from it
Gradle NDK/JNI build support (if we ever need it)

Currently inactive/commented out.
Enlarged doge_02n. Replaced doge_02d with doge_04.
Fixed build bug with uncommented NDK code
Proper background rendering (issue #4)

Resizing and cropping is done manually because Android can’t do it
without making it look like crap.