Add auto imports for integration testing

JUnit tests can now be @SpringApplicationConfiguration
and @IntegrationTest without any explicit imports. Also
makes @RunWith(SpringJUnit4ClassRunner) optional.

Fixes gh-969

spring-boot-cli/src/test/java/org/springframework/boot/cli/TestCommandIntegrationTests.java

@@ -82,6 +82,12 @@ public class TestCommandIntegrationTests {
 		assertThat(output, containsString("OK (1 test)"));
 	}
 
+	@Test
+	public void integrationTest() throws Exception {
+		String output = this.cli.test("integration.groovy");
+		assertThat(output, containsString("OK (1 test)"));
+	}
+
 	@Test
 	public void spockTester() throws Exception {
 		String output = this.cli.test("spock.groovy");