BATCH-2111: Java 8 / Upgrade to Spring 4

* Upgrade Spring framework to 4.0.2.RELEASE
* Upgrade maven compiler plugin to 3.1
* Use LinkedHashMap to preseve ordering in AbstractFlowParser (found when upgrading to JDK 8)
* Match on EnhancerBySpringCGLIB in StepScopeProxyTargetClassOverrideIntegrationTests (SPR-11398)