Model and script changes to remove BatchRun objects
Remove BatchRun object and add BatchRun attributes to Batch object.
Merge branch 'batchrun-into-batch' of github.com:duke-libraries/dul-hydra into batchrun-into-batch

Conflicts:
	lib/dul_hydra/batch/models/batch.rb
	lib/dul_hydra/batch/models/batch_run.rb
	lib/dul_hydra/batch/scripts/batch_processor.rb
remove BatchRun object
Remove BatchRun object and add BatchRun attributes to Batch object.
Merge branch 'batchrun-into-batch' of github.com:duke-libraries/dul-hydra into batchrun-into-batch
Merge pull request #347 from duke-libraries/batchrun-into-batch

Remove BatchRun object and add BatchRun attributes to Batch object.