DATACMNS-364 - Infrastructure to allow redeclaring CRUD methods with queries.

Introduced new meta-annotation QueryAnnotation to mark and identify store specific Query annotations. This enables us to handle finder methods annotated with such store specific annotations in a generic way. Adjusted DefaultRepositoryInformation.getQueryMethods(…) to consider custom store specific query annotations.

Original pull request: #43.

src/main/java/org/springframework/data/annotation/QueryAnnotation.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2013 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.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.data.repository.Repository;
+
+/**
+ * Meta-Annotation to mark a store specific annotation as a query annotation. This allows generic special handing of
+ * finder methods on {@link Repository} interfaces.
+ * 
+ * @author Thomas Darimont
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.ANNOTATION_TYPE)
+public @interface QueryAnnotation {
+}