AMQP-162 Fix ExchangeParser for binding-arguments

JIRA: https://jira.springsource.org/browse/AMQP-162

AMQP-162: Addressing PR's comments

Improve `headers-exchange` parsing and `What's new` section

Polishing
AMQP-45: Add Routing ConnectionFactory

JIRA: https://jira.springsource.org/browse/AMQP-45

AMQP-45: Add SimpleRoutingConnectionFactory

* Add `SimpleRoutingConnectionFactory` and `SimpleResourceHolder`
* Add test and docs
AMQP-39 Add AMQP MessageBuilder

Fluent API for building messages.

Add equals() and toString() implementations for Message and MessageProperties.

JIRA: https://jira.springsource.org/browse/AMQP-39

AMQP-39 Polishing; PR Comments

Biggest change is to break out a separate MessagePropertiesBuilder.

However, the MessageBuilder uses one as a delegate so that the
fluent API can be used directly on the MessageBuilder without
having to build a separate MessageProperties first.

AMQP-39 Polishing - Use Class Hierarchy

MessageBuilderSupport (abstract) with subclasses
MessageBuilder and MessagePropertiesBuilder.

AMQP-39 Fix equals Tests

Fix Typos in Docs
AMQP-116 Add Paragraph on Tracer

JIRA: https://jira.springsource.org/browse/AMQP-116
Polishing What's New in 1.3 Section
[artifactory-release] Release version 1.3.0.M1
[artifactory-release] Next development version
AMQP-306 Doc Fixes

Fix version (incorrectly stated 1.2.1 instead of 1.3.0)
Add what's new for dynamic consumers
AMQP-356 Reduce Test Log Levels

4 Test cases generate > 6Mb of logs; causes CI build delays.

JIRA: https://jira.springsource.org/browse/AMQP-356
master: Build: -Dlog4j.debug=true to check on CI
AMQP-359: Reset amqp-log4j to default after test

JIRA: https://jira.springsource.org/browse/AMQP-359

Previously `AmqpAppenderIntegrationTests` configured `LogManager`
to use `log4j-amqp.properties`, who turned on DEBUG for `org.springframework.amqp.rabbit`
and all other tests generated a lot of DEBUG log message for their reports.
It causes a long time for parsing test results on CI.

Revert `LogManager` to use `log4j.properties` after `AmqpAppenderIntegrationTests`

**Cherry-pick to 1.2.x**