Move 'samples' into 'tests' folder

Some of the samples are more like pure integratiuon tests (I wouldn't
use them to copy code into a real app). So I put them with the other
"test" projects.

tests/samples-messaging-integration/src/main/java/com/example/BookDeleted.java

@@ -0,0 +1,31 @@
+/*
+ *  Copyright 2013-2016 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package com.example;
+
+import java.io.Serializable;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+
+@SuppressWarnings("serial")
+public class BookDeleted implements Serializable {
+	public final String bookName;
+
+	@JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
+	public BookDeleted(String bookName) {
+		this.bookName = bookName;
+	}
+}