Add BooleanUtils library

exec/lib/BooleanUtils.java

+package lib;
+
+public class BooleanUtils {
+
+  public int toInt(boolean value){
+    if (value){
+      return 1;
+    } else {
+      return 0;
+    }
+  }
+
+  public BooleanUtils println(boolean value){
+    System.out.println(toInt(value));
+    return this;
+  }
+}
+