Add Crashalytics SDK
Set 0.x as debug version and a version name suffix for debug builds
Fix typo in constant
Ignore generated files
Disable crashlytics plugin for now (breaks the build if plain API key is not in AndroidManifest)
Change internal storage of values from 2-dimensional ArrayList to 2-dimensional int-array

Unfortunately the code accessing the data was not as isolated as it should have been so the whole engine including the tests needed to be adjusted.
But the rewrite should have brought some major performance issues when rotating the grid for other movements than to the right.
Add tests for other directions and use cases
Add proof of concept for SquareGridView (random colors + coordinate display)
Remove test values, set fixed background color
Remove fest, add butterknife and proguard rules
Add colors and cleaned values (no -1 on empty)
Add recognition of game over and game won, handling of these states (temporary textview) and auto-play mode for testing