reorganize classes so test data is separate from test cases

src/test/java/org/json/junit/data/StringsResourceBundle.java

@@ -0,0 +1,19 @@
+package org.json.junit.data;
+
+import java.util.*;
+
+/**
+ * A resource bundle class
+ */
+public class StringsResourceBundle extends ListResourceBundle {
+    @Override
+    public Object[][] getContents() {
+        return contents;
+    }
+    static final Object[][] contents = {
+        {"greetings.hello", "Hello, "},
+        {"greetings.world", "World!"},
+        {"farewells.later", "Later, "},
+        {"farewells.gator", "Alligator!"}
+    };
+}