Add generator app for simple table of *AutoConfiguration

Run with "mvn spring-boot:run" and then scrape the Markdown from stdout.
(Result already added to docs/autoconfig.md.)

spring-boot-docs/src/test/java/org/springframework/boot/docs/ApplicationTests.java

@@ -0,0 +1,17 @@
+package org.springframework.boot.docs;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.SpringApplicationContextLoader;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = AutoConfigurationDocsApplication.class, loader=SpringApplicationContextLoader.class)
+public class ApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}