bump version in README
Release version 1.0.0.RC1
Released 1.0 RC1 - change version to 1.0.0.BUILD-SNAPSHOT
XD-1995 StepExecution count for JobExecution

- Spring batch admin `SimpleJobService`'s `getJobExecutions(int start, int count)`
doesn't have step executions count for each job execution returned.
 - Get step executions explicitly for each job execution in the list
XD-1462: Tests for AggregateCounter

Fix warning