Fix SpEL varargs handling and usage of other getValue() methods

Building on the initial work for SPR-12326, this commit
addresses three problems:

Firstly the ReflectiveMethodResolver is modified to consider
a direct parameter match more important than a varargs match.
Also in that same type when there are a number of close
matches, the first one is taken rather than the last one.

Secondly more testcases and better support have been added
for the case of passing a single parameter to a varargs
accepting method.

Finally it is possible to set the root context object
indirectly and not pass it on getValue() calls to the
expression objects but not all variants of getValue()
were handling that. This is now fixed.

Issue: SPR-12326
EclipseLinkJpaDialect's getJdbcConnection uses a lazy ConnectionHandle (allowing for deferred internal transaction begin)

Issue: SPR-7753
Polishing
Consistent throwing of BeanInstantiationException for factory methods, including a hint about circular references

Issue: SPR-12317
Latest dependency updates (EhCache 2.9, Joda-Time 2.5, Jackson 2.4.3, Tiles 3.0.5, Tomcat 8.0.14, FreeMarker 2.3.21)
Test for ImportBeanDefinitionRegistrar double scan

Issue: SPR-12334
Polishing
Revised test for ImportBeanDefinitionRegistrar double scan

Issue: SPR-12334
(cherry picked from commit 6e5711a)
Allow defining default content negotiation strategy

During the HTTP Content Negotiation phase, the ContentNegotiationManager
uses configured ContentNegotiationStrategy(ies) to define the list of
content types accepted by the client.

When HTTP clients don't send Accept headers, nor use a configured
file extension in the request, nor a request param, developers can
define a default content type using the
ContentNegotiationConfigurer.defaultContentType() method.

This change adds a new overloaded defaultContentType method that takes a
ContentNegotiationStrategy as an argument. This strategy will take the
current request as an argument and return a default content type.

Issue: SPR-12286
QualifierAnnotationAutowireCandidateResolver calls BeanFactory.getType defensively

Issue: SPR-12191
Polishing
Polish SPR-12286

Issue: SPR-12286
Polish Javadoc
Update documentation for Map arguments

Issue: SPR-12347
Update javadoc
ClassReader relies on autoboxing for reuse of cached primitive values

Issue: SPR-12365
HibernateTransactionManager supports result access after completion

Issue: SPR-12349
Support text/xml and application/*+xml in Jackson XML message converter

Issue: SPR-12366
TilesConfigurer defensively expects null from getResources in case of no resources found

Also includes order preservation for resource results with Tiles 2 as well as retrieval failure logging with Tiles 3.

Issue: SPR-12362
Polishing