renamed test app to include the word demo, since I always look for de…

…mo, but never find anything :/

src/test/java/demo/MailTestApp.java → src/test/java/demo/MailTestDemoApp.java

@@ -19,7 +19,7 @@
  * @author Benny Bottema
  */
 @SuppressWarnings({ "WeakerAccess", "UnusedAssignment" })
-public class MailTestApp {
+public class MailTestDemoApp {
 
 	private static final String YOUR_GMAIL_ADDRESS = "your_gmail_user@gmail.com";