AMQP-290 Fix Exch. and Queue Argument refs

Fix AMQP-290. Add the correct reference contructor to the parser, so
exchange or queue arguments can reference a map.

Add test cases for exchanges and queues.

Add more Tests for AMQP-290

Polishing; formatting; add error if both ref and nested.
 - fix queue placeholder tests
AMQP-335: Add checkTestConfigs Gradle task

* Fix configs vulnerabilities

JIRA: https://jira.springsource.org/browse/AMQP-335
AMQP-336 Rule to Skip Long Integration Tests

Skip on normal builds; set up a nightly plan to run with all.

Reduced build time from 15 mins to 2.
AMQP-241 Add package-info Files; Use SPR css