INT-3146 Fix Test Timing Issue

Wait for server connection factory to start listening for new tests.
INT-3027: Headers Enrichment for <enricher>

* Add `<header>` sub-element to `<enricher>`
* Refactoring of `EnricherParser`
* Add Headers Enrichment logic to `ContentEnricher`
* Add tests
* What's new and Content Enricher's `<header>` note

JIRA: https://jira.springsource.org/browse/INT-3027

INT-3027: Addressing PR comments

INT-3027: add NPE asserts to map properties

INT-3027: add overwrite & type to enricher header

Move `HeaderValueMessageProcessor` hierarchy to 'transformer.support' package

INT-3027: Make header's overwrite=true by default

Doc Polishing
INT-3146 Fix Another Test Timing Issue

Increase test timer for soTimeout detection.
INT-3133: Add <spel-property-accessors> Support

* Add <spel-property-accessors> to configure a list of beans
that implement `org.springframework.expression.PropertyAccessor`
* Add `SpelPropertyAccessorRegistrar` to manage a list of PropertyAccessors
for Integration infrastructure
* Refactoring for `SpelFunctionRegistrar` and `IntegrationEvaluationContextFactoryBean`
to fix the issue when there is no `SpelFunctionRegistrar`(`SpelPropertyAccessorRegistrar`)
in the child AC, but there is one in the parent.
Previously the inheritance did't work for that reason.
* Now parent/child logic moved to `IntegrationEvaluationContextFactoryBean`
* Add documentation

JIRA: https://jira.springsource.org/browse/INT-3133

INT-3133: Rebasing, polishing and documentation

INT-3133: PropertyAccessors override support

* `@Ignore` `SOLingerTests#finReceivedNioLinger()` test

INT-3133: Change JavaDoc link to 3.0.0.RC1

Polishing

- Remove duplicate check - last bean def wins
- Doc Polishing
INT-3133 Doc Polishing
INT-3142 Allow Merging of HTTP Message Converters

INT-3142: A flag to retain default converters when the user has customized messageconverters for HttpRequestHandlingController, HttpInboundGateway

* Introduced a new flag in the base class of HttpRequHttpRequestHandlingController, HttpInboundGateway - registerDefaultConverters
* Introduced a new attribute "register-default-converters" for inbound-channel-adapter and inbound-gateway to indicate if the default HttpMessageConverter's need to be registered
* Http namespace parser related changes to set the new flag
* Added additional tests to test the flag and the namespace parser related changes

Changes per feedback from Artem - additional javadoc comments, cleaned up tests

Updated: Setting the register-default-converters by default to false now, for backward compatibility reasons
Changed adapter name per feedback from Artem

Changed adapter name per feedback from Artem

Changed attribute name from register-default-converters to merge-with-default-converters

INT-3142: Atomic operation for messageConverters

'What's New' polishing

Polishing

Fix a few comments, error messages, docs, whitespace.
INT-2768 Add XSLT Transformer Factory Class Name

Add the ability to inject the class name of the xslt transformer
implementation.

https://jira.springsource.org/browse/INT-2768

-add @author to java docs
-updat copywrite year to current year

add new test and check for class name that it exists.

-fix xslt payload transformer and test for unknown class name, will
now default to the jre default transformer.
INT-2768: Add BeanClassLoaderAware
INT-2768 Polishing - Docs, White Space

Add what's new; fix white space in test case.
Merge pull request #897 from mbazos/INT-2768

* INT-2768:
  INT-2768 Polishing - Docs, White Space
  INT-2768: Add BeanClassLoaderAware
  INT-2768 Add XSLT Transformer Factory Class Name
INT-3133-2: PAs Inheritance Refactoring

JIRA: https://jira.springsource.org/browse/INT-3133

INT-3133-2: Addressing PR's comments
INT-3152 Speed Up Build Times

Add a `@Rule` to skip long-runing tests during normal builds.

Add the rule to long-running tests in gemfire, ip, jms, jmx.

Add an environment variable `RUN_LONG_INTEGRATION_TESTS`; when set
to true, all tests are run.

Set the environment variable to true on all nightly builds.

Build now runs in 13 minutes on my 3 year old laptop.
Polishing - Switch to TestWatcher

TestWatchMan is deprecated.