refactor test classes to their own modules

MyBean.java

@@ -0,0 +1,16 @@
+package org.json.junit;
+
+import java.io.*;
+
+/**
+ * Used in testing when Bean behavior is needed
+ */
+interface MyBean {
+    public Integer getIntKey();
+    public Double getDoubleKey();
+    public String getStringKey();
+    public String getEscapeStringKey();
+    public Boolean isTrueKey();
+    public Boolean isFalseKey();
+    public StringReader getStringReaderKey();
+}