General JPA 2.0+ requirement; upgraded build and tests to EclipseLink 2.4, OpenJPA 2.2, Hibernate 3.6

* 3.2.x: (28 commits)
  Hide 'doc' changes from jdiff reports
  Document @Bean 'lite' mode vs @Configuration
  Final preparations for 3.2.2
  Remove Tiles 3 configuration method
  Polishing
  Extracted buildRequestAttributes template method from FrameworkServlet
  Added "beforeExistingAdvisors" flag to AbstractAdvisingBeanPostProcessor
  Minor refinements along the way of researching static CGLIB callbacks
  Compare Kind references before checking log levels
  Polish Javadoc in RequestAttributes
  Fix copy-n-paste errors in NativeWebRequest
  Fix issue with restoring included attributes
  Add additional test for daylight savings glitch
  Document context hierarchy support in the TCF
  Fix test for daylight savings glitch
  Make the methodParameter field of HandlerMethod final
  Disable AsyncTests in spring-test-mvc
  Reformat the testing chapter
  Document context hierarchy support in the TCF
  Document context hierarchy support in the TCF
  ...

Rework the reference documentation to better distinguish the differences
between @Bean methods used in @Comonent vs @Configuration classes. The
'Using the @Bean annotation' section now only covers concepts applicable
when using @Bean methods in @Configuration _or_ @Component classes.
Information only applicable to @Configuration classes has been moved to
a new  'Using the @Configuration annotation' section.

An additional sidebar section attempts to explain the differences
between the two approaches.

Issue: SPR-9425

Issue: SPR-10361

Also, RequestBindingInterceptor now obtains HttpServletRequest from locally passed-in request handle and delegates to buildRequestAttributes as well now.

Issue: SPR-10342

Just AsyncAnnotationBeanPostProcessor switches "beforeExistingAdvisors" to "true" by default. So effectively, MethodValidation/PersistenceExceptionTranslationPostProcessor apply after existing advisors by default again, fixing the 3.1->3.2 regression.

Issue: SPR-10309

Specifically, our CallbackFilter doesn't hold an implicit reference to the containing ConfigurationClassEnhancer class anymore.

Issue: SPR-10307

# By David Harkness
* patch-1:
  Compare Kind references before checking log levels

Assuming reference comparisons are much quicker than checking
likely-nested logger levels, perform the former first.

Also, since the reference can match only one of the instances,
use "else if" to short-circuit the search.

Before this change the DispatcherServlet restored modified and also
removed added attributes but did not restore removed attributes.

Issue: SPR-10360

# By Dave Syer
* dsyer-feature/crontest:
  Add additional test for daylight savings glitch

The problem was that clocks go forward *at* 2am, so
2am doesn't exist once a year. Users might be surprised
that their cron trigger doesn't go off one night, but that
is arguably correct (and what happens now). The test can be
modified if we decide to change the trigger behaviour.

This commit updates the reference manual regarding the new support for
@ContextHierarchy and hierarchy modes in @DirtiesContext.

Issue: SPR-10357

Fix test for daylight savings glitch

Previously the methodParameter array field was initialized lazily since
it requires reflection. However, in practice the field is always used
and there is not much benefit from the lazy initialization.

In Spring Framework 3.2, the methodParameter field was copied when a
new HandlerMethod instance (with the resolved bean) is created for
performance reasons. That introduced a synchronization issue since
the lazy initialization was not synchronized.

Issue: SPR-10365

This commit reformats the testing chapter (and adds minor polishing
changes) in order to avoid massive merge diffs in upcoming commits.

Issue: SPR-10357