Display last job execution parameters

@SEE: https://github.com/spring-projects/spring-batch-admin/pull/20

With switching to Spring-Batch 2.2.x the data model changed, so that JobParameters are no longer part of a JobInstance but of JobExecution.

I think because of this change the JobParameters column in job.ftl was deleted because it shows the JobInstances.

Like diplaying the status of the last JobExecution I included the it JobParameters as it was in spring-batch-admin 1.2.x.