* pull313:
  Document that applicaiton.yml requires snakeyaml

Update documentation to reference the need for a yaml library to be on
the classpath.

Fixes gh-313

Add a setRegisterShutdownHook option to SpringApplication allowing the
shutdown hook to not be registered.

Also update SpringApplicationBuilder to automatically disable shutdown
hooks for child contexts.

Fixes gh-314

Fix `EmbeddedServletContainerAutoConfiguration` so that it does not
accidentally eagerly initialize factory beans.

Fixes gh-306

Extract all inner @ConfigurationProperties classes from @Configuration
classes for consistency.

Extract Mongo auto-configuration classes from Spring Data specific
auto-configuration, allowing Mongo to be used without Spring Data
if require.

Disable Mongo auto-configuation when @EnableMongoRepositories is used
and adapt the test helper classes accordingly.

Change the property prefix and dependency management version property
from `...mongo` to `...mongodb` for consistency with Spring Data.

Fixes gh-315

Update javadoc and method names to indicate that ApplicationInitializer
and ApplicationListeners are `Order` sorted before being invoked.

Also remove specific sorting from SpringApplicationBuilder, relying
instead on the Order sorting.

Fixes gh-316

Prefer Ordered HIGHEST_PRECEDENCE and LOWEST_PRECEDENCE constants to
Integer MAX_VALUE or MIN_VALUE.

Improve package structure and attempt to co-locate related classes.

Restore the previous `spring.profiles.active` logic effectively
reverting commit 37069d91. This ensures that active profiles defined in
a higher `PropertySource` replace those lower down.

In addition, add support for a `+` prefix that can be used to indicate
that a profile should be added to the active set.

For example:

	# application-prod.properties
	spring.profiles.active=+proddb,+prodmq

Fixed gh-308, gh-309

Update ErrorMvcAutoConfiguration thymeleaf condition to use the
`spring4` package.

Fixes gh-310

Fixes gh-312

Update `EndpointWebMvcAutoConfiguration` to use '-1' to indicate that
the management context should be disabled. This brings consistency
between the server settings and the management settings and allows '0'
to be used to pick a random port.

Fixed gh-311

Fix `ConfigFileApplicationListener` to repeatedly load property sources
and activate profiles using any defined `spring.active.profiles`
properties.

This restores the ability to have a property in a profile specific
file that defines additional profiles.

Fixes gh-308

Rename AutoConfigurationReport to ConditionEvaluationReport and
co-locate with conditions.

Fix package tangle between the `org.springframework.boot` and the
`event` sub-package. A new `SpringApplicationRunParticipant` abstraction
has been introduced, with the `event` package solely responsible for
handling event multi-casting.

Update SpringApplication so that source objects are no longer considered
as ApplicationListeners or ApplicationContextInitializer.

Detect when an application is running in development (by the presence
of a build file) and automatically add a 'development' profile.

Additional detectors can be developed by implementing the
`ProfileDetector` interface and registering with the `SpringApplication`

Fixes gh-296

Update SpringApplication so that ApplicationListener and
ApplicationInitializer methods must be called separately. This helps
to prevent unexpected side effects when calling the setters and
also encourages separation of concerns.

The few situations where a class was both an ApplicationInitializer
and ApplicationListener are now handled by registering an inner
listener from the `initialize` method.

Move SpringApplication events to their own package, create a common
base class and rename classes to match Spring conventions.

Defaults to false

Update the CLI Groovy InnerLoader to not expose URLs. This prevents the
'TLD skipped' log messages from Tomcat that occurred previously due to
the InnerLoader and parent returning the same URLs.

Fixes gh-277