Remove outdated references to ContextLoaderServlet

Issue: SPR-7725
(cherry picked from commit b45d08f)
Jackson2ObjectMapperFactoryBean builds on revised Jackson2ObjectMapperBuilder now

Issue: SPR-12243
ExecutorSubscribableChannel's SendTask actually returns local MessageHandler now

Issue: Issue: SPR-12272
Polishing
Jackson2ObjectMapperBuilder allows for regular constructor usage as well

Issue: SPR-12243
Next Development Version
polishing
Adding @AjSuppressWarnings on some advices

Issue: SPR-12239
Merge pull request #655 from kicktipp/SPR-12239

* SPR-12239:
  Adding @AjSuppressWarnings on some advices
Fix javadoc glitch

Issue: SPR-12282
Fix VerifyError for SpEL ternary compilation

The ternary expression node was failing to generate the
necessary unboxing bytecode when the condition part
of the expression returned a boxed Boolean rather than
a primitive boolean.

Also fixed here is an IllegalAccessError that was
seen in the same expression due to generating a
CHECKCAST bytecode for a private type.

Issue: SPR-12271
fix typo
Merge pull request #651 from unpush/typofix

* typofix:
  fix typo
Sensible defaults for Servlet & Filter registrations in mock

Prior to this commit, the getter methods in MockServletContext threw an
UnsupportedOperationException when trying to retrieve Servlet and
Filter registrations.

This commit improves the behavior of these methods by returning null
when a single registration is requested and an empty map when all
registrations are requested. This is now in line with the Javadoc for
ServletContext. Note, however, that the corresponding setter methods
still throw UnsupportedOperationExceptions which is suitable behavior
for a mock.

Issue: SPR-12290
DecoratingClassLoader and its subclasses register themselves as parallel capable on Java 7+

Issue: SPR-12285
DataSourceTransactionManager resets ConnectionHolder on doBegin failure

Issue: SPR-12280
CompositePropertySource extends EnumerablePropertySource now

Issue: SPR-12292
AbstractMessageChannel triggers afterSendCompletion with previously resolved non-null Message in case of preSend returning null

Issue: SPR-12295
JavaMailSenderImpl considers empty username and password as not set (for use with placeholders)

Also includes varargs declaration for applicable send methods.

Issue: SPR-12294
Polishing