delete .test binaries
print errors from cmdline
Remove unused struct
split workload list and worker factories
move redis connection/config out of store
Redis-based workload implementation
store reloads experiments

Also got rid of buffering in laboratory.go because premature
optimization killed the cat or something
change flag for enabling redis store
Ensure worker stub is configured in redis mode
Add redis prereq now needed by tests to README
Remove dead code
Merge pull request #61 from cloudfoundry-community/redis

Redis-based worker implementation