Remove the 'final' modifier from SingletonBeanFactoryLocatorTests
to work around the "cannot extend final class" error issued when
running all tests. The error was due to confusion with IDEA between
the two variants of SingletonBeanFactoryLocatorTests across
spring-context and spring-beans.

Rename one of the GroovyMessenger classes to GroovyMessenger2.
Previously there were multiple Groovy classes named
'GroovyMessenger', causing a compilation error in certain IDE
arrangements.

Update import-into-idea.md documentation

Add various IDEA artifacts to .gitignore
 - ignore derby.log wherever it is written
 - ignore IDEA's test-output directory
 - ignore IDEA's Atlassian connector config file

* SPR-10124:
  Support snapshot versions qualified by branch name

Issue: SPR-10121

Previously the algorithm used by GenericConversionService to find
converters incorrectly searched for interfaces working up from the
base class. This caused particular problems with custom List
converters as as the Collection interface would be considered before
the List interface giving CollectionToObjectConverter precedence
over the custom converter.

The updated algorithm restores the class search order to behave in the
same way as Spring 3.1.

Issue: SPR-10116
Backport-Issue: SPR-10117
Backport-Commit: aa914497

Issue: SPR-10107

Issue: SPR-10108

Issue: SPR-10109

Issue: SPR-10099

Issue: SPR-10102

- @WebApplicationContext --> @WebAppConfiguration

Backport-Commit: 62e9d6b1

 - Remove unnecessary "overview of new features" section in 3.1
 - Mention new Gradle build and GitHub-based source control in 3.2

Pick up fix for regression in version 0.2.3 that caused project-specific
images, e.g. diagrams not to be copied into the images/ folder, thereby
causing broken image links online and in the PDF.

Issue: SPR-10092

Issue: SPR-10091

 - Added missing <para> tags to the JDiff reports section.

 - Converted tabs to spaces.

This commit adds information to the 3.2 migration guide regarding
deprecations and Maven dependencies in the spring-test module.

Replace all API links with the correct springsource.org URL

Issue: SPR-10035

This reverts commit c10d63dc.

Removed "target" entry from gitignore, allowing to commit changes to the "org.springframework.aop.target" package

In particular, avoiding synchronized Sets and Maps wherever possible (preferring a ConcurrentHashMap even instead of a synchronized Set) and specifying appropriate ConcurrentHashMap initial capacities (even if we end up choosing 16).

Also initializing the capacity of the AntPathStringMatcher cache to 256 now.

This is not a comprehensive update, only covering the "What's new"
sections for now.

Previously buildSrc/src/main/groovy was a source folder within Eclipse.
This caused build errors due to missing dependencies for Gradle.

This commit removes buildSrc/src/main/groovy from the source folders
within Eclipse to prevent errors from being displayed.