INT-3294 Support Implicit Input Channel with Ann.

JIRA: https://jira.springsource.org/browse/INT-3294

Previously, implicit input channel creation was not
supported for annotated endpoints.

Register a `DirectChannel` if the input channel does
not exist in the context.
INT-3299 Remove Unneeded Dependency From IP

JIRA: https://jira.springsource.org/browse/INT-3299

The IP module incorrectly has s-i-stream as a transitive dependency.

It is only used in a test case.
INT-3404 Clarify Router Attributes

JIRA: https://jira.springsource.org/browse/INT-3304

Add notes to explain the relationship between `resolution-required`
and `default-output-channel`.
INT-3305 SFTP Close Session on Error

JIRA: https://jira.springsource.org/browse/INT-3305

Previously, if the channel can't be connected (e.g. if the server
does not support SFTP), the connection to the server remained open.

Close the session in the event of a failure.

Add test with the Apache SSHD server.
INT-3305 Fix SFTP Test Case

JIRA: https://jira.springsource.org/browse/INT-3305
INT-3298 WARN if `RSFB` Falls Back to SeqSizeRS

JIRA: https://jira.springsource.org/browse/INT-3298

Emit a WARN log whenever the `ReleaseStrategyFactoryBean`
falls back to using the `SequenceSizeReleaseStrategy`.

This will happen if no method name is provided and no
annotated method is found, or a null reference is provided.
INT-3312: Add Support for `outputChannelName`

JIRA: https://jira.springsource.org/browse/INT-3312

* Add `setOutputChannelName` to `AbstractReplyProducingMessageHandler` and `SourcePollingChannelAdapterFactoryBean`
to allow to have 'late binding' and resolve the real channel from `AC` on component initialization, instead of creation phase
* Add `setRequestChannelName` and `setReplyChannelName` to `ContentEnricher` for the same purpose
* Make `HeaderValueMessageProcessor` implementation `public`. It is useful for JavaConfig and DSL
* Polishing parsers to use classes, not their names as strings

INT-3312: PR comments

INT-3312: Polishing
INT-3313: Fix JMS-outbound requires-reply Logic

JIRA: https://jira.springsource.org/browse/INT-3313

Previously, when `requires-reply="false"` on a `<jms:outbound-gateway/>`
a `null` reply caused a `MessageTimeoutException`, instead of quiet ending of flow.
INT-3308 SubscribableChannel Optimization

JIRA: https://jira.springsource.org/browse/INT-3308

INT-3308 Move Optimization to AbstractDispatcher

- avoids the need for `canShortCutDispatcher()`
- optimizes all framework channels, including AMQP, JMS
- slight additional performance improvement

INT-3308 FinalSingleHandlerChannel

This is still a work in process.

TODO:Parser, parser tests.

See the DirectChannelTests for perforance results.

INT-3308 'Final' Channel Parser Changes, Tests

INT-3308 Polishing; PR Comments

INT-3308 Polishing

* Rename 'final' attribute to 'fixed-subscriber'
* Rename `BasicSingleFixedSubscriberChannel` to `FixedSubscriberChannel`

INT-3308 Polishing

* Rename test cases to match channel
* Fix parser error messages
* Add more exclusive attribute/element tests

INT-3308 More Polishing

* Remove remaining textual references to 'final'
* WARN log if the single subscriber has auto-startup="false"
* Handle the case when a fixed subscriber channel is declared after its handler
* Support the use of a fixed subscriber channel for elements created by an AbstractOutboundChannelAdapterParser
Fix JavaDocs issues
INT-3309 Pluggable MessageBuilder

This is still a work in process.

There are a bunch of TODOs in classes
that are not managed by Spring and so
need to have the MessageBuilderFactory
injected.

But I am looking for feedback on the
approach.

INT-3309 Resolve TODOs

Provide access to the MessageBuilderFactory in all classes.

INT-3309 Polishing + Tests

* Fallback to 'fromMessage()' if mutating and inbound message is not MutableMessage
* Add 'alwaysMutate' boolean to MutableMessageBuilderFactory - coerces 'fromMessage' calls to 'mutateMessage'
* Add tests

INT-3309 Polishing; PR Comments

Also add tests to parent/child contexts where the parent has the
default message builder and the child has a mutable message builder.

INT-3309 More Polish; PR Comments

Also fix removeHeader in MMB.
Update spring-amqp to 1.3.0.RC1