Add autoconfig support for Jersey (2)

Jersey 2 has some Spring support built in but it's a bit awkward to
use in a Boot app, so autoconfiguration seems appropriate. The tests
and sample show how to use it, but the short story is that any
@Component can define JAX-RS endpoints via @GET etc.

There's a sample for Jersey 1 as well (pay careful attention to
the plugin configuration if you want to build an executable jar)

Fixes gh-1651

spring-boot-samples/spring-boot-sample-jersey1/src/test/java/sample/jersey1/SampleJersey1ApplicationTests.java

@@ -0,0 +1,30 @@
+package sample.jersey1;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.IntegrationTest;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import sample.jersey1.SampleJersey1Application;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = SampleJersey1Application.class)
+@WebAppConfiguration
+@IntegrationTest("server.port:0")
+public class SampleJersey1ApplicationTests {
+	
+	@Value("${local.server.port}")
+	private int port;
+
+	@Test
+	public void contextLoads() {
+		assertEquals("Hello World", new TestRestTemplate().getForObject("http://localhost:" + port + "/", String.class));
+	}
+
+}