SGF-318 - Upgraded to Spring Framework 4.0.7.
SGF-320 - Disable ClusterConfigurationIntegrationTest.testClusterConfiguration test case.

Due to a race condition/bug in the new GemFire 8 Locator Cluster Configuration Service on startup, the race is causing a timing issue for the testClusterConfiguration test case in the CI (Bamboo) env even though the test case runs successfully, locally.  These timing issues are despite an appropriate and reasonable wait period setup by the test class where the 'integration-based' test is attempting to coordinate between a forked GemFire Locator process hosting the Cluster Config Service and the test case, which is a peer cache, that uses it.
SGF-325 - Create spring-gemfire-2.0.xsd and spring-data-gemfire-2.0.xsd for SDG 2.
SGF-323 - Add support for GemFire 8's DiskStore 'diskUsageCriticalPercentage' and 'diskUsageWarningPercentage' properties in the SDG XML namespace (XSD) and DiskStoreFactoryBean API.
SGF-316 - Updates Spring Data GemFire Reference Guide with 1.5 changes (e.g. Auto Region Lookups, Region Templates)
(cherry picked from commit a5104b165905dd603060585ea62ba61ae60af7c5)

Signed-off-by: John Blum <jblum@pivotal.io>
SGF-308 - Updated changelog.
SGF-327 - Avoid setting null values with GemFire's Cache Region put(key, value) operation when GemFire is used as the caching provider in Spring's Cache Abstraction (@Cacheable).
SGF-333 - The SpringContextBootstrappingInitializer needs to handle the case when it's init(:Properties) method maybe called more than once on initialization.
SGF-328 - Add missing 'hostname-for-senders' attribute on the <gfe:gateway-receiver> element in the SDG XML namespace (XSD).
SGF-330 - Add missing 'disk-synchronous' attribute to the <gfe:gateway-sender> element in the SDG XML namespace (XSD).
SGF-332 - Add support for the GatewaySender 'eventSubstitutionFilter' property in the SDG XSD and GatewaySenderFactoryBean API.
SGF-335 - Refactor ProcessUtils and fix the GatewayReceiverNamespaceTest class hang in the Bamboo SDG Nightly Build when mocking is disabled.
SGF-331 - Pull common WAN attributes from GatewaySenders and AsyncEventQueues in the SDG XSD into the 'commonWANQueueAttributes' attributes group.
SGF-338 - Both <gfe:custom-entry-ttl> and <gfe:custom-entry-tti> SDG XML namespace elements allow for more than one 'CustomExpiry' bean to be set in the Region Expiration Attributes although GemFire only allows one!
SGF-326 - Create spring-gemfire-1.6.xsd and spring-data-gemfire-1.6.xsd for SDG 1.6.
SGF-339 - Change all VMWare-based links in the SDG Reference Guide to Pivotal-based links.
SGF-340 - Change a SpringSource-based links in the SDG Reference Guide to Spring.io-based links.
SGF-341 - Reset SDG project version to 1.6.0.BUILD-SNAPSHOT for the current Spring Data Release Train (Fowler).
SGF-343 - Optimize the SDG implementation of CrudRepository.save(Iterable<S> enttiies) to use GemFire's Region.putAll(Map<K, V> values) operation.
SGF-342 - Update Spring Data GemFire Reference Guide with GemFire 8 functional support.