INT-3082 (S)FTP Remove Deprecated 'cache-sessions'

The 'cache-sessions' attribute was deprecated in 2.1 in favor
of using a configured CachingConnectionFactory to provide more
flexibility, such as setting the cache size.

Remove the attribute from the schemas.

Update tests.

Add docs.

Update Migration Guide on the project Wiki.
INT-3110 Fix JMX Control Bus With SF 3.2.3

Spring 3.2.3 registers MBean operations with parameter names
instead of the JVM default p1, p2 etc based on parameter position
in the method signature.

Since the OperationInvokingMessageHandler matched the supplied
arguments using the p1, p2 etc names, this prevented the control
bus from finding the target method.

Fall back to the old naming scheme based on parameter position
if a matching parameter is not found.

Add a test using a Map payload to supply the named arguments (p1, p2).

Add an ignored test that tests using named arguments (key, channelName).

Test with 3.1.4; remove Ignore and test with 3.2.3.

TODO: remove the Ignore annotation when SF 3.2.3 is the minimum.
INT-1807 Add Mechanism For Headers with TCP

TCP streams have no standard message structure. Therefore, the
TCP implementation previously only transferred the message
payload.

If someone wanted to convey header information, they would have
to write their own wrapper and/or use Java serialization for
the entire message.

This change provides a strategy to allow users to determine
which headers are transferred, and how.

A MessageConvertingMessageMapper is now provided that invokes
any MessageConverter. A MapMessageConverter is provided that
converts the payload, and selected heades to a Map with two
entries ("payload") and ("headers").

A MapJsonSerializer is provided that converts a Map to/from
JSON. Jackson can't delimit multiple objects in a stream
so another serializer is required to encode/decode structure.
A ByteArrayLfSerializer is used by default, inserting a
linefeed between JSON objects.

The combination of these elements now allows header
information to be transferred over TCP. Of course, users
can implment their own (de)serializer to format the
bits on the wire exactly as needed by their application.

INT-1807 Polishing

Add a test that uses a Map MessageConverter with a
Java (de)serializer.

INT-1807: Polishing

INT-1807: Rebased and polished

Change `MapJsonSerializer` to use `JsonObjectMapper` abstraction

Doc Polishing
Update Project Lead
Update Maven Dev Info
INT-3067 Xslt method=text StringResult coercion

Previously there was a need to add `result-type="StringResult"`
to <int-xml:xslt-transformer> for xslt output `method='text'`
in case payload was non-standard type (e.g. `File`), if we wanted to get
result as text.

* Add coercion to `StringResult` code, if `Transformer`'s property `method` is 'text' and there is no explicit `resultFactory` provided.
* Add documentation to reference manual

JIRA: https://jira.springsource.org/browse/INT-3067
INT-2901 Fix Mail HeaderEnricher Doc

The move from attributes to child elements was not reflected
in the reference manual.
INT-2901 Add Namespace Prefix

Avoid confusion with the core header enricher.
Fix Syslog Test

Test didn't wait for the TCP server to start listening.
INT-3087:Fix MongoDbMessageStore RemoveMessage Bug

Add new query so the same message found in pollMessageFromGroup is the
one which gets deleted.

See jira for more details: https://jira.springsource.org/browse/INT-3087

INT-3087 Polishing

Use an atomic method in pollMessageFromGroup to pop the first message.

Add test cases for pollMessageFromGroup and removeMessageFromGroup
where the same message exists in multiple groups.
INT-3111 Fix Close Cached TCP Connection

A TCP Connection is closed when an outbound gateway times out.

However, with the CachingClientConnectionFactory, the connection
was returned to the pool instead of being physically closed.

Override forceClose() and physically close the connection so the
next time it is retrieved from the pool it is detected as stale
and re-established.

Refactor test case and invoke it twice; once with a regular connection
factory and once with a cached factory.

Remove an unused logger.
INT-2822: 'requires-reply' for Outbound Gateways

* Add `requires-reply` attribute for all adapters outbound gateways as `true` by default
* WS-outbound-gateway is still without it, because it has its own specific attribute `ignore-empty-responses`
* Make `requires-reply` as `false` by default for `jdbc:stored-proc-outbound-gateway` inasmuch as `jdbc:stored-proc-outbound-adapter`
doesn't have ability to configure `returning-resultset`
* add parser tests for `requires-reply`

JIRA: https://jira.springsource.org/browse/INT-2822

INT-2822 'requires-reply' for ws:outbound-gateway

Default false.

INT-2822: Polishing after rebase

INT-2822: deprecate 'ignore-empty-responses'

* Add 'requires-reply' section into What's New

INT-2822: remove 'ignore-empty-responses' from RM

INT-2822: Polishing after rebase

INT-2822: Rebased and polished

INT-2822: Rebased and polished

Add WARN within deprecated `AbstractWebServiceOutboundGateway#setIgnoreEmptyResponses`

Revert 'ignore-empty-responses'; Doc Polishing
INT-3063: 'Expires' HTTP header workaround

According to RFC 2616 HTTP clients should ignore invalid values
for date-aware header, but Spring MVC `HttpHeaders` raises
`IllegalArgumentException` in this case.
Proposal fix to Spring Integration just to `try...catch` call of
`HttpHeaders.getExpires()` and `return null`.

JIRA: https://jira.springsource.org/browse/INT-3063