Add @SpringApplicationConfiguration (for integration testing)

Example:

    @RunWith(SpringJUnit4ClassRunner.class)
    @SpringApplicationConfiguration(classes = SampleDataJpaApplication.class)
    public class CityRepositoryIntegrationTests {

    	@Autowired
    	CityRepository repository;

Fixes gh-66.

spring-boot/src/test/java/org/springframework/boot/test/SpringApplicationConfiguration.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2012-2013 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.boot.test;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.test.context.ContextConfiguration;
+
+/**
+ * @author Dave Syer
+ */
+
+@ContextConfiguration(loader = SpringApplicationContextLoader.class)
+@Documented
+@Inherited
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface SpringApplicationConfiguration {
+
+	/**
+	 * @see ContextConfiguration#value()
+	 */
+	String[] value() default {};
+
+	/**
+	 * @see ContextConfiguration#locations()
+	 */
+	String[] locations() default {};
+
+	/**
+	 * @see ContextConfiguration#classes()
+	 */
+	Class<?>[] classes() default {};
+
+	/**
+	 * @see ContextConfiguration#initializers()
+	 */
+	Class<? extends ApplicationContextInitializer<? extends ConfigurableApplicationContext>>[] initializers() default {};
+
+	/**
+	 * @see ContextConfiguration#inheritLocations()
+	 */
+	boolean inheritLocations() default true;
+
+	/**
+	 * @see ContextConfiguration#inheritInitializers()
+	 */
+	boolean inheritInitializers() default true;
+
+	/**
+	 * @see ContextConfiguration#name()
+	 */
+	String name() default "";
+
+}