Fix ResourceHttpRequestHandler empty location log

Fix ResourceHttpRequestHandler to only log warning when locations
is empty.

Issue: SPR-10780
(cherry picked from bc52469)
Resource-based PlatformTransactionManager implementations defensively catch Throwable in doBegin in order to reliably close resource in case of OutOfMemoryError

Issue: SPR-10755
(cherry picked from commit 2e4eb9f)
Moved executor null check to AsyncExecutionInterceptor, allowing AbstractAsyncExecutionAspect to fall back to sync execution (as in 3.2.1)

Issue: SPR-10636
(cherry picked from commit b6c54c3)
Skip abstract beans in getBeansWithAnnotation()

Update BeanFactory.getBeansWithAnnotation() to skip any abstract
bean definitions.

Issue: SPR-10663
(cherry picked from commit 8ed8ee2)
Include argument types in MethodReference cache

Update the cached MethodExecutor in MethodReference to include the
method argument types. Prevents the incorrect use of the cache when the
SpEL expression refers to a class that has overloaded methods.

Issue: SPR-10657
(cherry picked from commit f9b12b8)
Fix Jaxb2TypeScanner to scan for @XmlRegistry

Update ClassPathJaxb2TypeScanner to scan for @XmlRegistry classes.

Prior to this commit explicitly configured @XmlRegistry annotated classes
were not registered with the JAXBContext when using the 'packagesToScan'
property of the Jaxb2Unmarshaller.

Issue: SPR-10714
(cherry picked from 4f871d4)
Fix issue with parsing x-forwarded-host header

Issue: SPR-10701
Update gradle plugin versions
Upgradle to gradle 1.6
Make HTTP scheme parsing case-insensitive

Issue: SPR-10779
Upgradle to gradle 1.6
Minor polish to gradle build
Add test source dependency in attempt to fix CI
Revert "Add test source dependency in attempt to fix CI"

This reverts commit a2e438b2be171372913d18419450132cafde11b4.
Add CUSTOM_COMPILATION TestGroup
Add attributeDoesNotExist ModelResultMatcher

Issue: SPR-10509
Upgradle to gradle 1.6
Fix failing test due to CUSTOM_COMPILATION Group
Fix TestNG build settings
Polishing

Issue: SPR-10609