INT-3301 Update Versions of Numerous Dependencies

JIRA: https://jira.springsource.org/browse/INT-3301

INT-3301 Polishing; Bump Hibernate to 4.3.1

* Fix JDBC Test after version update
* Bump Hibernate version to fix failing test

Latest versions of HSQLDB and Spring
INT-3301 Polishing

* Close Context After JDBC Tests
* Fix SFTP Mock Tests

JIRA: https://jira.springsource.org/browse/INT-3301
INT-3300: Fix `MS` ref Regression for i-c-adapter

JIRA: https://jira.springsource.org/browse/INT-3300

The change introduced by https://jira.springsource.org/browse/INT-3147
(Registration of `MessageSource<?>` as a bean with suffix `.source`) broke
the case where `MessageSource<?>` is a reference to an existing bean.

Add check to the `AbstractPollingInboundChannelAdapterParser` for the type
of `source` and apply the appropriate logic.

INT-3300: Get rid of Spring Boot dependency

Remove test case that introduced a cyclic dependency.
INT-3307 Twitter: Upgrade Spring Social Twitter to 1.1.0

Jira: https://jira.springsource.org/browse/INT-3307
INT-3306 Document Release Strategy POJO Limitation

JIRA: https://jira.springsource.org/browse/INT-3306

Add a caution about using POJO ReleaseStrategy with large groups.
INT-3310 Fix Syslog Error on Socket Close

https://jira.springsource.org/browse/INT-3310

Previously, the syslog adapter tried to convert the ErrorMessage
that results from a socket error to a syslog packet, resulting
in a stack trace on stderr.

Test for the ErrorMessage and log at DEBUG.