Closes gh-2539

Update SpringApplicationContextLoader to configure test property
locations before the ApplicationContext is actually started.

Fixes gh-2198

Previously, MongoProperties did not consider the configuration of a
custom authentication database when creating a MongoClient. This
commit updates MongoProperties to use the authentication database
when it is configured, falling back to the normal database when it is
not configured.

Closes gh-2562

* elasticsearch:
  Remove unnecessary if statement

* javadoc:
  Fix Javadoc

Fixes gh-2443

Update SpringApplicationContextLoader to support @TestPropertySource
location attributes.

Fixes gh-2198

Add a `security.basic.authorize-mode` property that can be used to
affect how basic security authorization is applied.

Fixes gh-2462

Rename `spring.favicon.enabled` to `spring.mvc.favicon.enabled`.

See gh-2377

* docs:
  Improve documentation

Closes gh-2553

Closes gh-2554

Closes gh-2242

Simplify the MustacheEnvironmentCollector so that it no longer binds
the Spring Environment to a Map.

See gh-2242

Provide details of how to configure Gradle, including the work-around
require to parse any additional metadata files.

Fixes gh-2316

Fix automatic '/' -> 'index.html' forwarding to also work when a
`server.servlet-path` property is set.

Fixes gh-2351

* pull2479:
  Supported relaxed binding on inner classes

Update RelaxedDataBinder to support relaxed binding to inner classes
in the same way as normal configuration objects.

e.g. `nested.foo_bar` => `nested.fooBar`

Fixes gh-2463
Closes gh- 2479

Update ElasticsearchAutoConfiguration to ensure that local nodes are
closed when the context is closed. Prior to this commit the close()
method of the Client would be called which had no effect for local
Nodes.

Fixes gh-2480

Update @AutoConfigureBefore and @AutoConfigureAfter annotations to
support String classnames in addition direct Class references.

Fixes gh-2529

Fixes gh-2547

Allow MultipartConfigElement bean to be created even if a
MultipartResolver bean has been defined by the user.

Fixes gh-2538

Update MetricFilterAutoConfiguration to ensure that it is only applied
if Spring MVC is on the classpath.

Fixes gh-2542

Fix some eclipse errors and warnings caused by XSD validation errors and
classes in the wrong place.

See gh-2539

Rename RepositoryRestMvcBootConfiguration to
SpringBootRepositoryRestMvcConfiguration so that it follows the same
naming pattern as other custom Spring Boot configurations.

See gh-2392

Update ConfigurationMetadataAnnotationProcessor so that `prefix` is
only obtained when the annotation is not null. Also improve exception
message by including the element.

Make spring-boot-integration-tests a top level project and move the
existing gradle tests and security tests to be sub-modules.

Update invoker configuration so that only folders with a pom.xml file
are invoked. This helps when switching between the 1.1.x and master
branches since empty folders left by git no longer fail the build.