Previously, specifying a simple target name for a regular project would
store the (zip) archive in a file matching the target name. Only adding a
slash at the end of the name allows to extract it as a directory. It
turns out that such convention is not easy to catch and if a simple name
is provided on the command-line, the user probably wants to create a
directory with such a name with the content of the project.

Note that if a build file is required and the name does not have any
extension, we still store a file with the required name as auto-detecting
the extension to use is not that easy.

Fixes gh-2056

See gh-2028

Fixes gh-2028

Add a `spring.mvc.set-ignore-default-model-on-redirect` property to
allow RequestMappingHandlerAdapter.setIgnoreDefaultModelOnRedirect to
be easily customized and change the default value to 'true'.

Fixes gh-2018

Drop the setAdditionalProperties method from ShellProperties to ensure
that it is not included in the meta-data JSON. The additional properties
are usually wired in using @Autowired and it is pretty unlikely that
anyone is using the setter directly.

Fixes gh-2055

Fix YamlPropertySourceLoader to correctly flatten keys merged from
different documents.

Closes gh-2022

See gh-1996

Previously, a property holding an array did not have a proper default
value in the meta-data even though the related field was initialized
properly.

An explicit support for arrays has been added. The "defaultValue" now
holds the default value for singular properties or an array of values for
array-based properties. If the value is initalized with an empty array,
the default value is an empty array as well.

Closes gh-1996

Fixes gh-1439

Previously, any valid property was added to the meta-data of the current
group. This can be annoying for types that are not meant to be bound from
a simple string value. ClassLoader is one example.

A list of well-known types has been added: if the property type matches
an element of this list, it is ignored.

Fixes gh-2012

Fixes gh-2041

Update YamlPropertySourceLoader to use a MapPropertySource rather than
a PropertiesPropertySource to ensure that the underlying order is
retained.

Fixes gh-2022

Upgrade to the SNAPSHOT so that CI will catch any problems early.

See gh-2038

Add ConfigurationWarningsApplicationContextInitializer to report
warnings for common configuration mistakes. Currently the initializer
will log a warning if @ComponentScan is used on a @Configuration class
in the "default" package.

Fixes gh-2050

Closes gh-2049

Fixes gh-2048 and fixes gh-2051

* spring-jms-pub-sub-fix:
  Apply pubSubDomain property to ContainerFactory

Previously, tuning the pubSubDomain flag only impacted the created
JmsTemplate leaving any default listeners with the default settings.

If no default JmsListenerContainerFactory is defined, the created
one is using that property as well now.

Closes gh-2044

SecurityAutoConfiguration, via its import of
AuthenticationManagerConfiguration, requires spring-security-config
to be on the classpath as AuthenticationManagerConfiguration extends
GlobalAuthenticationConfigurerAdapter from spring-security-config.

This commit makes SecurityAutoConfiguration conditional on the
presence of GlobalAuthenticationConfigurerAdapter so that the
auto-configuration will be disabled in its absence rather than causing
an app to fail to start.

Closes gh-2046

This commit adds support to the CLI for launching a custom
SpringApplication implementation. The class that is launched can be
configured using the spring.application.class.name System property
or the SPRING_APPLICATION_CLASS_NAME environment variable with the
former taking priority.

Closes gh-2030

Closes gh-2043

See gh-1995

Conflicts:
	spring-boot/src/main/java/org/springframework/boot/logging/LoggingApplicationListener.java

Change the visibility of ErrorPageFilter to public to fix
IllegalAccessException errors on certain servlet containers.

Fixes gh-2026