Update ConfigurationClassUtils to only consider beans with @Bean
methods as 'lite' configuration candidates.

Prior to this commit all @Component beans were considered 'lite'
configuration candidates which could result in a large number of
ConfigurationClass instance being created that would ultimately be
ignored.

Issue: SPR-10609

Update AnnotationBeanNameGenerator to only use the value attribute of
a @Component meta-annotated annotation when it is a String.

Issue: SPR-10580

Remove duplicate Javadoc comment from PathResource that was
accidentally introduced during the merge.

Issue: SPR-10608

# By Philippe Marschall
* SPR-10608-rebase:
  Introduce java.nio.file.Path based Resource

Develop new org.springframework.core.io.Resource implementation
backed by java.nio.file.Path. Primarily developed to allow custom
file system implementations to be used with Spring.

Since the minimum requirement for Spring is still Java 6 the
existing FileSystemResource can't be retrofitted (and no #getPath
method can be added to the Resource interface).

Unlike FileSystemResource, PathResource delegates to the underlying
file system instead of StringUtils. It has therefore slightly
different semantics. First, when building relative resources via
createRelative the relative path will apply to this path (like URL or
Unix). Second, equality is delegated to the underlying file system
provider so it's case-insensitive on Windows.

Issue: SPR-10608

# By Stevo Slavic
* SPR-10571:
  Replace MaxPermSize use in build scripts

Since JDK 8 is required to build Spring framework 4, and permanent
generation is gone from Java 8, to eliminate warnings about no longer
available MaxPermSize switch, it should be removed or replaced with new
MaxMetaspaceSize switch.

This fix replaces old with new switch to limit the amount of native
memory used for class metadata.

Issue: SPR-10571

Add support for the EnvironmentAware interface with ImportSelector
and ImportBeanDefinitionRegistrar implementations.

Issue: SPR-10602

Test property placeholder with multiple locations and default values.

Issue: SPR-10619

 - cherry-pick of pull request #257, which originally applied to 3.2.x

Issue: SPR-10394

# By Chris Beams (1) and Dave Syer (1)
* SPR-10579:
  Polish pull request #291 per committer guidelines
  Make CommandLinePropertySource enumerable

 - Update Apache license headers
 - Remove trailing whitespace
 - Edit original commit comment to use 'Issue:' syntax
 - Revert use of diamond operator (<>) in main sources

See committer guidelines at
https://github.com/SpringSource/spring-framework/blob/master/CONTRIBUTING.md

Issue: SPR-10579

JOpt 4.4 has enumerable options, so this change can be made
if we upgrade. The only awkward thing is that JOpt allows
aliases for options, so we have to pick one to avoid double
counting. This implementation picks the last one in the list
which is the alphebtically last of the long options, if there
are any (e.g. "o1", "option1" returns "option1"). Most of the
time there will only be one or two aliases for each option so
it won't matter.

Issue: SPR-10579

The submitted pull requests for SPR-10572 did not build.

This commit fixes the MergePlugin to create from configurations rather
than the project. It also removes unnecessarily added code that was
commented out.

Issue: SPR-10572

Recently Spring framework build has been updated to use Gradle 1.6.
With the new version some of the Gradle APIs have been deprecated.
These deprecated APIs have been used by Spring build specific Gradle
plugins, which resulted in deprecation warnings in build output.

This patch changes Spring build specific Gradle plugins to use new
Gradle APIs instead of deprecated ones.

Even after this change build still produces warnings about Gradle
deprecated APIs being used. These come from Spring shared Gradle
plugins and other 3rd party Gradle plugins in use, like Gradle
Artifactory Plugin (GAP), which are still not updated to Gradle 1.6.
Related tickets for updating of these plugins to Gradle 1.6 are
GRADLE-53 and GAP-144, and once they get resolved Spring framework
build should further be updated.

Issue: SPR-10572

Update README adding explicit JDK instructions

Re-order subsections to make it clear that running a full
`./gradlew build` is not necessary just to import projects
into your IDE or to build and install jars to your .m2 cache.

Add a test to ensure that the CI server does not accidentally build
with the wrong JDK version.

Issue: SPR-10569

Issue: SPR-10514

Issue: SPR-10449

Issue: SPR-10547

Issue: SPR-10436

This change involves a modification of the "writeContent" template method to include the "jsonPrefix" String instead of the "prefixJson" boolean flag. Since said template method has only been introduced in 3.2.2, this change should hopefully not be a problem.

Issue: SPR-10567

Issue: SPR-10568

Issue: SPR-10374

Issue: SPR-10546
(cherry picked from commit 6e4317eb)