Makes them a lot more readable IMO, and also enables @Autowiring
from the context into the test case (sweeet). I added @DirtiesContext
to all of them as well to be on the safe side, but possbly that can be
optimized in some way as well.

Allowing use of embededded container in @SpringApplicationConfiguration
tests, e.g.

```
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Config.class)
@WebAppConfiguration
@IntegrationTest
public class SpringApplicationIntegrationTestTests {

	@Test
	public void nestedConfigClasses() {
		String body = new RestTemplate().getForObject("http://localhost:8080/",
				String.class);
		assertEquals("Hello World", body);
	}

	@Configuration
	@EnableWebMvc
	@RestController
	protected static class Config {

		@Bean
		public DispatcherServlet dispatcherServlet() {
			return new DispatcherServlet();
		}

		@Bean
		public EmbeddedServletContainerFactory embeddedServletContainer() {
			return new TomcatEmbeddedServletContainerFactory();
		}

		@RequestMapping("/")
		public String home() {
			return "Hello World";
		}

	}

}
```

Fixes gh-473

Per discussion: fixes gh-467

Fixes gh-470

We had been making a special case for logback.xml anyway, so
extending that to simply deleting recursively all of
src/main/resources (or equivalent) from target/classes (or
equivalent) seems like it's perfectly justifiable.

Fixes gh-451

The management.contextPath property should now be respected in a
secure application, whether or not the management.port is different.

Added some test cases in the sample to verify.

Fixes gh-469

Boot promotes the use of a templates directory for housing view
templates. Include this directory by default when building a jar file
from a CLI app.

Fixes #455

Fixes gh-463

Explicitly link to install.txt in source repo to avoid issues on projects.spring.io with a broken relative link
... also fix this for rendered markdown on GH itself :-)

Use org.springframework.boot instead of ${project.groupId}
groupId in order to make it easier to use spring-boot-samples
modules as a starting point for new projects.

Fixes gh-447

This turns out to affect JPA, but only because it looks for a URL for the
root of the classpath using ClassLoader.getResource("") which barfs in
an app launched from an executable JAR. It's easy to make a special case
for "" in the class loader, so I went ahead and did that. Possibly need
to think what the implication of getResources("") is as well (not
tested in an app yet).

Fixes gh-420

Fixes gh-441

Profiles set with Environment.setActiveProfiles() (rather than
spring.profiles.active) *before* any config files are processed, are
treated as "additional" (to the ones supplied in spring.profiles.active
from all sources, files and System properties included).

Fixes gh-429

Fixes gh-438

Fixes gh-417

RC4 added a ServletRegistrationBaen for teh DispatcherServlet and we
didn't register a MultipartConfigElement if one was present.

Fixes gh-427

Fixes gh-424

Fixed gh-428

Fixes gh-430

Fixes gh-433

... leaving only the embedded Tomcat enabling feature (registering
the WsSci).

Fixes part of gh-65

* patch-2:
  Correct link to samples.

Fixes gh-415

Rename ErrorWrapperEmbeddedServletContainerFactory to ErrorPageFilter
and extend AbstractConfigurableEmbeddedServletContainer rather
than AbstractEmbeddedServletContainerFactory.

Fixes gh-416