* SPR-9984:
  Ignore performance-sensitive tests by default
  Introduce 'spring-build-junit' subproject

Make use of the new JUnit functionality introduced in the previous
commit to 'Assume' that perfomance- and timing-sensitive tests should
run only when TestGroup.PERFORMANCE is selected, i.e. when
-PtestGroups="performance" has been provided at the Gradle command line.

The net effect is that these tests are now ignored by default, which
will result in far fewer false-negative CI build failures due to
resource contention and other external factors that cause slowdowns.

We will set up a dedicated performance CI build to run these tests on
an isolated machine, etc.

Issue: SPR-9984

Introduce new 'spring-build-junit' subproject containing shared
JUnit utilities and classes to be used by other test cases. This
project is for internal use within the framework, and therefore
creates no artifacts to be published to any repository.

The initial code includes support for JUnit Assumptions that can
be used to determine when a test should run. Tests can be skipped
based on the running JDK version, logging level or based on specific
'groups' that have activated via a Gradle property.

It is intended that sources within the spring-build-junit project be
folded into spring-core/src/test/java, pending some Gradle work that
will facilitate sharing test output across subprojects; therefore this
commit should be seen as a temporary solution.

Issue: SPR-9984

* SPR-10126:
  Replace EasyMock with Mockito in test sources

Issue: SPR-10126

* SPR-10129:
  Add @Override annotations to test sources
  Update test source and target JDK compatibility

Issue: SPR-10129

"test" source and target compatibility has been upgraded to 1.7 except
where noted, allowing us to use 1.7 language features such as
diamond-style (<>) generics declarations, automatic resource management
and multi-catch. More importantly, we will be able to upgrade to 1.8
once it is available in order to make use of lambda expressions, etc in
our test cases.

IDE configurations must be relaxed to allow 1.7 across the board, as
neither Eclipse nor IDEA are clever enough to allow for different
language levels across production and test resources. See [1] for a
feature request on that front.

spring-oxm is a special case here, and has been pinned at 1.6
compatibility even for its test sources in order to avoid a class
verification error that JibX throws when encountering 1.7-level
bytecode [2].

Likewise with spring-orm, toplink encounters a similar class
verification error, so has been pinned to 1.6 for the time being.
When we remove the (already deprecated since 3.2) Toplink support
we can restore compatibility to 1.7.

[1]: http://youtrack.jetbrains.com/issue/IDEA-97814
[2]: http://jira.codehaus.org/browse/JIBX-465

Issue: SPR-10129

* SPR-9431:
  Update -Xlint compiler warning output
  Fix various compiler warnings in spring-context
  Fix "unnecessary @SuppressWarnings" warnings
  Fix [rawtypes] compiler warnings
  Fix [dep-ann] warnings with @Deprecated
  Fix [cast] compiler warnings
  Fix [serial] compiler warnings
  Fix [varargs] compiler warnings
  Fix warnings due to unused import statements

Enable output for the compiler warnings that have been eliminated so
far. 'rawtypes', 'deprecation', and 'unchecked' remain suppressed until
these warnings can be fully eliminated as well.

All warning types other than [deprecation] and [unchecked] are now
fixed in spring-context/src/test

 - Suppress rawtypes warnings for src/main
 - Enable rawtypes warnings for src/test

This commit attempts to to resolve all rawtypes problems across tests as
aggressively as possible, i.e. without regard for binary compatibility,
whereas main sources must be treated much more cautiously with an eye
toward compatibility.

Fix serialization warnings by applying @SuppressWarnings("serial")
when appropriate.

In certain cases and for unknown reasons, a correctly-placed
@SuppressWarnings("serial") annotation will fix the warning at the
javac level (i.e. the Gradle command-line), but will produce an
"unnecessary @SuppressWarnings" warning within Eclipse. In these
cases, a private static final serialVersionUID field has been added
with the default value of 1L.

Remove unnecessary 'null' argument from calls to vararg supported
methods and fix cast in ValidationUtils.invokeValidator().

* SPR-10128:
  Replace <code> with {@code} throughout Javadoc
  Fix various Javadoc warnings

Issue: SPR-10128

Issue: SPR-10128

* SPR-10127:
  Replace space indentation with tabs
  Remove trailing whitespace in source files

Issue: SPR-10127

  find . -type f -name "*.java" -or -name "*.aj" | \
    xargs perl -p -i -e "s/[ \t]*$//g" {} \;

Issue: SPR-10127

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