DATACMNS-1097 - Move classes to better matching packages.

Introduced new ExampleMatcherAccessor in data.support in favor of the now deprecated one in data.repository.core to avoid a dependency into the repositories subsystem to work with examples in general.

Added Degraph based test in order to avoid future cyclic package dependency violations.

Original pull request: #230.
Related ticket: DATAMONGO-1721.

src/test/java/org/springframework/data/DependencyTests.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017 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 org.springframework.data;
+
+import static de.schauderhaft.degraph.check.JCheck.*;
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+/**
+ * @author Jens Schauder
+ */
+public class DependencyTests {
+
+	@Test
+	public void noInternalPackageCycles() {
+
+		assertThat(
+				classpath() //
+						.noJars() //
+						.including("org.springframework.data.**") //
+						.filterClasspath("*target/classes") //
+						.printOnFailure("degraph.graphml"), //
+				violationFree() //
+		);
+	}
+
+}