Merge branch '37-add-a-nightmare-difficulty-mode-and-a-4x4-grid-size' into 'master'

Resolve "Add a nightmare difficulty mode and a 4x4 grid size"

Closes #37

See merge request !32

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lib/provider/data.dart

@@ -3,9 +3,9 @@ import 'package:flutter/foundation.dart';
 class Data extends ChangeNotifier {
 
   // Configuration available values
-  List _availableDifficultyLevels = ['easy', 'medium', 'hard'];
-  List _availableSizes = ['2x2', '3x2', '3x3'];
-  List _availableSkins = ['default', 'food', 'nature'];
+  List _availableDifficultyLevels = ['easy', 'medium', 'hard', 'nightmare'];
+  List _availableSizes = ['2x2', '3x2', '3x3', '4x4'];
+  List _availableSkins = ['default', 'food', 'nature', 'monsters'];
 
   List get availableDifficultyLevels => _availableDifficultyLevels;
   List get availableSizes => _availableSizes;

lib/utils/board_utils.dart

@@ -7,7 +7,7 @@ import '../provider/data.dart';
 class BoardUtils {
 
   static printGrid(List cells) {
-    String stringValues = '0123456789';
+    String stringValues = '0123456789ABCDEFG';
     print('');
     print('-------');
     for (var rowIndex = 0; rowIndex < cells.length; rowIndex++) {
@@ -64,7 +64,7 @@ class BoardUtils {
     List cells = [];
     int boardSize = int.parse(pow(grid.length, 1/2).toStringAsFixed(0));
 
-    String stringValues = '0123456789';
+    String stringValues = '0123456789ABCDEFG';
 
     int index = 0;
     for (var rowIndex = 0; rowIndex < boardSize; rowIndex++) {