Use the latest commit rather than a specific revision.
Use the latest commit rather than a specific revision.

ContinuumIO/docker-logstash,dant3/docker-logstash,awyrough/docker-logstash,eternnoir/docker-logstash,TaylorMonacelli/docker-logstash-pblittle,ContinuumIO/docker-logstash,pblittle/docker-logstash