- Added implementation for Enum and Map

- Moving the CustomClass to data folder.
- Removing JSONBuilder.java
- Moving the implementation of JSONBuilder to JSONObject.

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

@@ -0,0 +1,20 @@
+package org.json.junit.data;
+
+public class CustomClassB {
+  public int number;
+  public CustomClassC classC;
+
+  public CustomClassB() {}
+  public CustomClassB(int number, CustomClassC classC) {
+    this.number = number;
+    this.classC = classC;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    CustomClassB classB = (CustomClassB) o;
+    return this.number == classB.number
+    && this.classC.equals(classB.classC);
+  }
+}
+