Add template/install task for is_ingestion_running.sh script
Merge pull request #11 from dpla/is_ingestion_running

Add template for is_ingestion_running.sh script
Add BigCouch/ES maintenance scripts on central (refs #7738)

* Add scripts to backup, restore, and compact BigCouch databases
* Add Elasticsearch heap stats script
* Share install_ruby_tools.sh across multiple roles
* Add gems needed for BigCouch restore script via script
* Install rbenv and bundler on central