Updated project version to 3.1.0.BUILD-SNAPSHOT
XD-1622: Add tasklet and step type to Step's ExecutionContext for XD usage
XD-1390: Updated SimpleJobRepository to return StepExecutions from previous run so UNKNOWN check will apply
BATCH-2245 Cannot import Project into IntelliJ
BATCH-2247: Added creation of a JobExplorer by default to address the inability to create a Map based JobExplorer using java config
BATCH-2242: Stopping a job in STARTING state throws OptimisticLockingFailureException